Who was comparing the Nexus S to the Photon??? This is comparing the Photon to the SGS2. (in this case the Epic 4G Touch) you are comparing the Photon to a phone that came out last year like the E4GT has the same hardware. Just because it has the same radio doesn't mean they haven't fixed it or that it's going to perform the same, it may or it may not but you can't just down it without having any proof.
I can guarantee the Super Amoled + is more readable in full sunlight from a side by side experience (photon and infuse)
The SGS2 is a little better than the Photon and the E4GT adds on some things that make it even better (bigger screen, notification light, bigger battery)
But we won't know which one's better until the E4GT is released. My money's on the E4GT, just because of UI, camera, form factor, screen size, screen quality, video playback, processor, browsing speed, rootability, battery life (probably) and MHL (I heard the Photon didn't have this, correct me if I'm wrong)