I don't particularly favour one, they both compliment each other nicely in terms of aesthetic at least, but I'll say ATLAS just because I like the idea of playing as one of GLaDOS' old personality cores with legs.

My friend and I called our respective bots when they first made their appearance.  I'll be ATLAS.

@XFastfireX: ATLAS looks more like one of GLaDOS' personality cores though.  P-body looks more like a turret to me.

I like the look of ATLAS better. A.

ATLAS has the better name although P'body is no slouch.

P-Body looks like Stephen Merchant

Would you kindly let me wait until I have the game to make my decision?

" Would you kindly let me wait until I have the game to make my decision? "

im short and fat..

Whichever is left after the other player chooses first.

ill play the one my friend dosent wanna play.

I'm going with P-Body. He's kind of like the Luigi of the Portal bots. Plus, you know, I like orange more than blue.

I'm not too worried about which one I play as but I prefer Atlas' appearance.