Vertigo wins, because Kim Novak as a blonde is all kinds of devestating.
Rear Window has Grace Kelly, your argument is invalid. Seriously though, there are so many great Hitchcock movies to choose from, Vertigo just isn't my favourite of them by a long shot. That's not to say it's not a great film. I just enjoy watching something like Rear Window a lot more, or especially Rope, which is my personal favourite of his.
The problem I remember with Citizen Kane was that its main character had little to no redeeming qualities, which subsequently makes it hard to care about him or what rosebud means. Also, I'm sorry to say, I didn't like Orson Welles' performance that much. He's just not a very good actor (and neither was the actress playing his wife).
"Hah! That's turned you white, hasn't it? That's frightened you, you lily-livered, caramel-kidneyed, custard-coloured cad? Not so brilliant now, are you, eh? eh?"