Everyone already gave the reasons I chose a BRZ, but I figured I'd contribute also.
1. HID lights
2. leather/alcantara seats (I hate cloth seats)
3. Navigation
4. I like the front bumper on the BRZ much more
5. keyless entry FTW!
6. push start button
7. I'm also not a huge fan of Scion. Subaru has a much better reputation in my opinion. No offense to any FRS guys. I do like the FRS, I just prefer my BRZ