Interesting. I think that seed-breeder, company, age of seed matters a lot as well.
However, some breeders will tell you they haven’t completely mastered the whole feminization trick. He may be correct when you look at it. The only difference is the ease of growing for new growers who can’t deal with sexing. It’s easy for us but can be so stressful for people.
But further to his point, and not to disrespect feminized seed breeders, but there is still a bit of a consensus that regular seeds are better from a genetic stability standpoint. If you pay $50 for 10 regulars (getting 5 female) or you pay $50 for 5 feminized (getting 5 female) … same difference from a price standpoint. But the genetics will be better and more stable possibly in the regular seeds.
It really depends on what you plan to do. I have a mother grown from seed that has given me 25 and will soon give me 25 more. But if you don’t intend to clone or do anything other than simply grow and flower the plant then maybe it doesn’t matter so much.
I see his point though.