Big Devil XL Auto vs Big Devil FAST Version: Which Is Right for You?

1. Introduction

Big Devil XL Auto and Big Devil FAST Version are two related hybrids from Sweet Seeds that appeal to growers who want strong effects and straightforward cultivation. Both carry the “Big Devil” name and share a similar lineage, but they are built for slightly different types of growers and growing styles.

This comparison focuses on what matters most if you are choosing between them: how they differ in general terms, which is more suitable for beginners, what to expect around yield potential, and how their effects may compare based on the available information.

2. Quick Comparison Table

Feature	Big Devil XL Auto	Big Devil FAST Version
Breeder	Sweet Seeds	Sweet Seeds
Seed Type	Autoflowering (auto)	Feminized (photoperiod)
Genetics	Big Devil #2 × Jack Herer Autoflower	Big Devil Auto × secret strain
Type	Hybrid	Hybrid
Flowering behaviour	Autoflowering (time-based, no light-cycle change needed)	Photoperiod feminized (typically needs light-cycle change)
Yield	Good	Not specified
THC	Strong	Strong
Flavour / Aroma	Incense and citrus lemon	Not specified

3. Big Devil XL Auto Overview

Big Devil XL Auto is an autoflowering hybrid from Sweet Seeds created by crossing Big Devil #2 with a Jack Herer autoflower. As an auto, it moves from seed to harvest based on age rather than light schedule, which can simplify planning for many growers.

The breeder describes its yield as “good”, suggesting it is aimed at growers who want a balance between productivity and ease of cultivation rather than chasing extreme output at all costs. With a strong THC rating and a hybrid profile, it is intended for users looking for noticeable, powerful effects rather than a very mild experience, though specific effect descriptors are not provided.

One clearly defined feature of Big Devil XL Auto is its aroma: incense notes combined with citrus lemon tones. This makes it appealing if you care about both strength and a more characterful flavour profile, especially if you like sharper, citrus-leaning aromas with a hint of classic incense.

Because it is autoflowering, Big Devil XL Auto typically:

• Does not require a change in light cycle to initiate flowering.
• Can be more forgiving of minor timing mistakes with lighting.
• Is often chosen by beginners who want a more straightforward indoor or outdoor run.

Overall, Big Devil XL Auto suits growers who value simplicity, want a clearly “good” productive plant, and prefer not to manage photoperiod timing, while still aiming for strong THC levels and a distinctive incense-citrus profile.

4. Big Devil FAST Version Overview

Big Devil FAST Version is a feminized hybrid from Sweet Seeds. It is bred from Big Devil Auto crossed with a secret strain, and, as a feminized (photoperiod) seed, it is designed to produce female plants when grown under the correct conditions.

The FAST Version name usually indicates a shorter flowering period compared with standard photoperiod varieties, although a precise flowering time is not specified in the available data. Even without exact numbers, this type of strain generally targets growers who want to reduce the overall time to harvest while still working with a photoperiod plant.

Like its XL Auto counterpart, Big Devil FAST Version is listed as having strong THC. This places it in a similar potency category, appealing to users who prioritise pronounced effects. However, specific descriptions of its effect profile, yield, and aroma are not provided in the current data, so expectations should be kept general rather than focused on fine nuances.

As a feminized, non-auto seed, it will typically:

• Require a change in light cycle to trigger flowering indoors (for example, moving from a longer to a shorter day length).
• Give growers more direct control over plant size and veg time.
• Be more suitable for those comfortable managing a photoperiod schedule.

Big Devil FAST Version is therefore likely to appeal to growers who prefer photoperiod control, want strong effects, and are drawn to the idea of a quicker-than-usual flowering phase, even though exact numbers for yield and aroma are not specified.

5. Key Differences

General Comparison

Both strains share the Big Devil heritage and are hybrids with strong THC, but they take different approaches to cultivation:

• Big Devil XL Auto is an autoflowering hybrid based on Big Devil #2 and Jack Herer Autoflower, with a clearly defined incense and citrus lemon aroma and a “good” yield rating.
• Big Devil FAST Version is a feminized hybrid derived from Big Devil Auto and a secret strain, with strong THC but no specific yield or flavour details given.

In practice, this means Big Devil XL Auto offers more predictable information out of the box (known aroma and yield category), whereas Big Devil FAST Version offers a more flexible photoperiod structure but with fewer published details about production and flavour.

Which Is Better for Beginners?

For a first-time grower or someone seeking easy cultivation, the seed type is the main practical difference:

• Big Devil XL Auto is likely the more beginner-friendly option. Its autoflowering nature removes the need to manage light-cycle changes to start flowering, which simplifies the learning curve. You can keep lights on a consistent schedule, and the plant will progress through its stages by itself.
• Big Devil FAST Version may suit growers who already understand or are willing to learn photoperiod control. You’ll need to manage when flowering starts by adjusting the light schedule indoors or timing outdoor planting with seasonal daylight changes.

If your priority is a forgiving first grow with fewer technical decisions, Big Devil XL Auto is generally the simpler choice. If you prefer to shape plant size and timing more actively and you’re comfortable with light management, Big Devil FAST Version can be an appealing route.

Yield Comparison

Yield is a key concern for many growers, especially those focused on getting as much as possible from their space.

• Big Devil XL Auto is explicitly described as having a “good” yield. While no exact numbers are given, this suggests it is designed to be reasonably productive without requiring extreme experience or advanced techniques.
• Big Devil FAST Version has no specified yield data in the available information. As a feminized, FAST Version hybrid, it may be bred with performance in mind, but without concrete figures or categories, it’s best not to make assumptions about whether it outperforms the XL Auto in practice.

If you want a strain with at least some yield guidance from the breeder, Big Devil XL Auto has the advantage, as you know it is positioned as a “good” producer. Big Devil FAST Version could be promising but comes with more uncertainty on output based solely on the information at hand.

Effects Comparison

Both strains are rated as having strong THC, which means either option is aimed at users who want robust, noticeable effects rather than something very light. However, beyond potency, effect descriptions are not provided for either strain.

• Big Devil XL Auto: Strong THC with no further detail on the character of the effects (e.g., energetic vs. relaxing) in the given data.
• Big Devil FAST Version: Also listed with strong THC, again without specific effect descriptors.

With this limited information, the main difference from an effects standpoint is not about the style of the high, but rather how you get there: through an autoflowering grow with known aroma and yield category versus a photoperiod FAST Version with more flexible training potential but fewer published details.

6. Which Should You Choose?

The better choice depends on your experience level, how much control you want over the grow, and whether you prioritise clear information about yield and flavour.

• Choose Big Devil XL Auto if:
  • You are a first-time grower or want an easy, low-maintenance introduction to cannabis cultivation.
  • You prefer to avoid managing light-cycle changes and want the simplicity of an autoflower.
  • A “good” yield with relatively little complexity is more important than maximising every last gram.
  • You value a defined incense and citrus lemon aroma profile.
• Choose Big Devil FAST Version if:
  • You are comfortable with photoperiod plants or willing to learn how to switch light cycles to induce flowering.
  • You like the idea of a FAST Version strain that may shorten the flowering period compared with typical photoperiods (even though exact times aren’t given).
  • You want strong THC and prefer the flexibility to extend or shorten the vegetative phase to shape plant size and structure.
  • You don’t mind that yield and flavour details are not fully specified and are open to exploring the strain yourself.

If your main priorities are ease of cultivation and having more concrete information before you start, Big Devil XL Auto generally stands out. If you’re aiming for a quick photoperiod grow and place higher value on control and experimentation, Big Devil FAST Version may be more appealing.

7. Final Thoughts

Both Big Devil XL Auto and Big Devil FAST Version are strong-THC hybrids from the same breeder, but they cater to different grower profiles. Big Devil XL Auto leans toward beginners and those who want straightforward, reliable results with a known “good” yield and defined incense-citrus character. Big Devil FAST Version is better suited to growers comfortable with photoperiod plants who want strong effects and the potential benefits of a faster flowering schedule, even if some details like yield and aroma aren’t clearly specified.

By weighing your experience level, your comfort with light-cycle management, and how much you rely on precise yield and flavour information, you can choose the Big Devil variant that best matches your goals for the grow room or garden.