The Photon will have a dock for productivity, When using cloud services like Google docs I can basically replace my laptop with a Photon.
The Photon is more secure, so I can actually store some military contacts and info on it. It has a GSM radio so it will work overseas when I am on missions in Europe and North Africa. It's a grown up's phone.
The GS2 offers nothing over the GS1, so what's the point? If all a person wants is to stare at low resolution benchmarks, then the GS2 is pretty cool. I personally expect more.
Not to mention Samsung sucks with support and updates.
As I said before, Samsung is trying to create Android Apple products, while HTC and Motorola are trying to create better smartphones.