You drive a hard question, man! I'd have to say Pokemon Stadium 2 was more enjoyable though, because it rocked when you had four people doing a minigame challenge.
Pokemon Snap was a really cool idea, I'll admit...but I liked the Stadiums better. It was just awesome seeing all of the moves that you grew up with come to life in THREE DIMENSIONS!
I can not express in words alone how disappointed I was with the stadium series. It was nothing but a Pokemon fight grindfest with none of the exploration of the original games and attack animations that... Well if it actually showed them HITTING your target I'd be impressed. This was not the case.
Even without bashing the competition, I'd choose snap. It was a picture based line shooter with creative puzzles, and if saying that alone isn't self evident of this, It was VERY UNIQUE. I wish there were more games that would mix things up like that.
@WarBuddy. You seem to have something to make up for by hating on Pokemon. Work out your insecurities elsewhere, EVERYONE plays Pokemon.