Yea, i dont think indoors really is leaps ahead of outdoor, and GH is pretty much indoor. The only difference i can really come up with is that outdoor and GH plants do produce higher amounts of cellulose due to the sun being such a strong light source. On top of all this, the biggest factor i believe is the size of your grow, huge outdoor grows will never be as good as a small outdoor grow, where the grower can focus on each plant, quality mostly comes down to how much quantity was grown. But,
All breeding should be done inside, simply becasue outdoors is an enviroment out of your control, and cannot allow you to 100% say these seeds were pollinated by that specific pollen. I think outdoor is neccesary to breed, so you can grow a large test sample, and select the best phenotypes. But if im shelling out 150- 200 for a pack of seeds, it better have been produced in a clean room, with no chance of contamination from wild or herm pollen.