Don't listen to mindless opinions.

It's all up to you. First off the Wii will be much harder to find come Christmas time. You'll probably have to wait for quite a while or be extremely lucky to pick one up.

The 360 on the other hand has a great library already and should be really easy to find. Just because it came out last year doesn't mean it's not next gen.

If I were you, I would pick up the 360 first and then get a Wii later on when more games are released on it.