Store near me sells bags of happy frog for $6. 1 bag per 3gallon fabric smartpot. :) so that's what I use now, or miracle grow moisture control worked great for me also actually. Just holds the right amount and drains well and i don't have to feed for a few weeks. The happy frog is new for me i just planted my first 4 autos into some a couple days ago and they are doing good as far as i can tell.. They're green and not dead looking so theres that lol time will tell as the grow picks up but so far so good.
My reasoning for choosing soil over the others was with hydro grows and even coco it seems the maintenance is thru the roof and things can go wrong very fast. I guess i just prefer the relaxed pace of the soil, i just kinda sit by my plants and enjoy them and its become kind of a meditation for me sitting there examining them stress free. I worry that I would lose out on that feeling of relaxation in growing while having to maintain things so much more often or worrying if you leave that the system doesnt fail or leak or whatever idk.. I feel at home with the soil.