been to europe and sa ... both real fun. i lived in salzburg austria (skied kitzsteinhorn) and spent about a month altogether in las lenas argentina. both places are amazing in their own right and you will have a fucking blast at either. but, if you want to maximize your skiing time i'd say come out west.
if you want to do a euro trip/ sa trip save up for longer so you can spend more time in those places cause 5 days will only be a cock tease and really not allow for that much wild times. anyway you slice it you should try and recruit a homie or two to come along cause that makes it a bit more fun at least before you meet fools on hill.