Well, I know for a fact that Sniper Wolf is cooler...
Especially since Otacon loves her. And I love Otacon. One day I would LOOOOOOVE to cosplay as Sniper Wolf, but I really wouldn't look good as her.

On the other hand... I love Snake and Liquid... they're so awesome. My best guy friend Michael/Funky7/FunkyBoy7/FunkyBoy47 is cosplaying as Snake for the anime convention we are going to... We're geting a box and writing "THIS IS NOT SNAKE" on it and he'll walk around in it.
I'm planning on dressing up as Liquid for a day. He's so cool.