GH3 - Wii or 360?

[Bube]

I'm thinking about buying Guitar Hero 3, but I can't decide which system to get it for.

360 has easier multiplayer, DLC and better sound (probably). But for some reason, I'm leaning towards the Wii version. Does the Wii version have DLC? I think the mono sound problems are fixed, but the multiplayer is still friend-code dependent, right?

In order of importance:
1. DLC
2. Multiplayer
3. Sound
4. Whatever (please specify)

Which version would you say has advantages/disadvantages? Keep in mind, I want to buy the Wii version more - but if there are huge differences, I'll go for the 360 version.

I need some opinions on this..