What i can say by experience is that skunk #1 from sensi seeds for instance, stretch a lot for indoor growing. If you do that you should top it to forve lower branches to reach upper's level. I did not do that and i don't have a lot of bud places. I decided to remove lower branches that did not see the light. Price is cheap, that's a good point. I can't speak about the potency yest.
Fhydro