it's all up to you and what breeder you're going with.. if i'm not mistaken, i think snow whites a nirvana strain.. if i were to buy nirvana beans, i'd go with their regs over fems as they seem to have some issues with their fems as well as their autos..
if it were another breeder such as dna, dr greenthumbs, sagarmatha, g13 labs, or some others, i have no problems going with fems, and i've yet to have any hermie plants come from a fem seed..