I think both parties are right. It all depends on how your game matches up to a certain range of opponents. I think I play exceptionally well against nitregs who take predictable lines, and stars is chock-full of those. The deep tables amplify that advantage exponentially because I can put them in much more difficult spots, and I probably have more experience playing deep than most just because I've always selected for deep games first.
Wherever you have the highest winrate at the end of the day is where you should be playing... quite obviously