I prefer the still version, but mainly because the animated version feels like the entire character's getting pulled up simultaneously, rather than just bits of him moving as a result of breathing. There's probably no reason for the gun and crotch to move like that. However, if you do want move movement, then I think it could use some motions that lag behind or precede the breathing, instead of being perfectly synced to he breathing. For example, consider having the head turn slightly, but perhaps between breaths, or maybe every other breath.