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I'm more suprised that the size difference of the game is mostly the audio after looking at the visual difference if anything. Both the 360 and PS3 versions can fit on a single DVD.

http://www.eurogamer.net/articles/digitalfoundry-portal2-face-off

Xbox 360 PlayStation 3
Disc Size 4.7GB 5.7GB
Install 4.7GB (optional) -
Surround Support Dolby Digital Dolby Digital, 5.1LPCM, 7.1LPCM

 

Enjoy, core game is good either way, PS3 just has a few edges over the 360 version this time around.