GrowCNanswered grow question 4y ago Part of the decision can depend on your location. I'm in N. America so I prefer to deal with companies on this side of the ocean for faster shipping and staff that's on a similar time zone if I need to contact them. This forum has a "breeders" section where you can see ratings. Keep in mind that most people haven't tried multiple breeders/suppliers so take some ratings with a grain of salt.
My only recommendation by name is to avoid Growers Choice. I have had multiple problems (mislabeled seeds, auto's that don't auto, mutations...) with about 15% of the seeds I've gotten from them.