I think either one will be a little bit over kill for beer cans. Even the big 44's won't put up much of a fight.
For elk, moose, and bears I would wait until the 325 WSM hits the market and buy that one. Ammo availability will be limited for a while but I doubt it will stay that way for long. You better snatch one up wuick though cause I doubt that the will stay on the shelves for very long.
If not I'd buy the 300WSM for the simple fact that it does not have a belted case. I much prefer a smooth bottle neck case to a belted one.