Right now I am in the same debate MJM. Recently, I have not bought an Xbox 360 game in a -long- time, partially because I was too lazy to buy a wireless adapter, and my PS3 has it built in. Therefore, I have been buying ALL my games for PS3, and my Live subscription even expired.
Just picked up Madden for PS3. However, with NHL coming out, i know that is a game I will definetly play online -alot-.
So now I am debating on going out to buy a wireless adaptor, as well as a new live subscription just for NHL 11...or just buy the PS3 Version.