Probably Short Stuff's regular seeds. they have a stable of excellent autoflowers, by a breeder called stitch who knows what he's trying to create with autoflowers. Their Mi5 is one of the more enjoyable autoflowers to watch grow. quick, strong and gives excellent yields of potent buds that most auto's on the market can't compare. as long as you dont tell anyone its autoflower, they wont be able to tell the difference.
im in the middle of attempting to breed my own and it takes a really keen patient eye to breed them correctly, im starting to already see traits(almost all are 10 days from seed) from both parents in my crosses. i got the f1's of these breeding experiments growing now in a tent(37 total atm) and i'm looking for a male autoflower that shows autoflowering heritage the latest, not the first male to show up, most likely the last to, cross it with a female of the same or similar pheno that has the autoflower expressed. after i get my f2's i'll do the same, not trying for any BX'ing but a stable selection of auto genetic and dank from the males used to pollinate (Chernobyl, Vortex, Jillybean). all are grown in separate families and crossed with one another.