not all strains are bred equally, go for breeders who have the knowledge and experience to breed better auto's, autoflowering strains are lower quality because they by natures have a timed death cycle, and that complicates breeding, i believe it diminishes selective variance, since you cannot clone an auto and keep it for a long time(not fake autoflowers who do not have timed death) and test it's stability, it relies upon the breeders skill and attempts, i recently made some f2's of (Fruit Auto x Vortex) i selected only autoflowering f1's, and those that went auto were a bit behind the rest on potency and yield, to select the best auto dominant is a small fraction of an entire crop. working on stabilizing a auto requires literally thousands of seedlings.
quality autoflowers generally come from paradise, world of seeds, short stuff and flash seeds(stitch the breeder). they offer longer lifespan sativa dominant autoflowers who give much higher yields and potency.