PS3 vs. XBOX 360???????

I'm getting one for Christmas, but don't know which one.....I'll get mostly COD games, and Bioshock, and EA Sports games. I also love to talk with headsets, and I know both have them, but which has more onliners using headsets?
Update: Wow, you guys went to town with these answers! Thank you all VERY much! :P
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