To me, outside of the online play and psn store...lowkey254
...and the cloud saves and the automatic updates and the fact that you actually get free stuff if you use their paid service.
The fact is that they both have their strengths and weaknesses. Live's overall integration is way better, but PSN doesn't force you to pay to play online and offers a lot more goodies with their paid service. In terms of how the games play online, they're on par with each other.
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