I'm a bit behind in posting, because it took me a while to play the Wii version.
First off, I was surprised how the menus were basically set up the exact same way as the DS version. The music tracks were all pretty similar too (sounded great on the Wii though).
Overall, I thought it was a fantastic game. The level length, and design was spot on. It was nice to have a few of those shorter ones thrown in too. It just would've been nice if there were a couple more planets. Still, there were more acts than the DS version. I was pretty thankful to have extra acts instead of the insanely tough missions from the DS.
The DS boss fights were a lot tougher, but I'm still undecided on which ones I prefer. It would've been nice if there as a bit more variety in the boss fights.
Looking forward to the next console Sonic game.