Sean Cody for the guys' looks, bodies and dicks (lots of straight guy solos, but since they're really straight, you don't see them again); Corbin Fisher for the sex--it's a little less staged and more realistic. Corbin Fishers models are generally twinks, but they're more real-world guys who "progress" into gay porn: solo, passive oral, active anal, and finally the whole nine yards.
Sean Cody would be the clear winner if he just let the guys go to it and didn't do separate "takes" with each change of position. But when Sean Cody does do great sex--it's great sex!