In defense of Xbox, PSN is no stranger to these children. Although it does seem to be a less common occurrence.
This. Both online networks have their fair share of inbred little tykes mouthing off.
However, they are more prominent on Call of Duty. You play other games like Battlefield, Forza, or Killzone, they are extremely rare :) --- Just call me "Pest." One of countless proud O&A Pests. Pests take over the Scott Ferrall Show '06 http://www.youtube.com/watch?v=Y95tboOKVR8
PC is the more "mature" system. Better web browsing support to help with all of that "mature" content.
Or are we asking about mature as in well-behaved and such?
I mean mature as in oriented towards an older demographic. Encouraging games that aren't just your generic FPS. Of course the other capabilities of the system would factor in as well.
So then it would be the PC. Being a game for a mature audience does not require pushing upon the moral border. Mature games don't need adult-oriented materials, violence, unnecessary levels of profanity, and etc. I do accept games that border on real life experiences to challenge our character, although.