Mii support is actually pretty cool. Make you own Miis of whatever you want vs using the generic people in GH. Nice.
The DS support, well just read the 2nd link. It sounds like a freakin' blast to play. Granted you'll need DS's or friends w/ DS's but it requires no other games and a small dl to the DS.
My main point wasn't so much that it has a vast amount of features the others don't, just that the features it does have extra plus the fact that it finally matches the PS360 versions in every way makes it a superior version. Not only that but finally the Wii version is worth the price as compared to the PS360 as it has no shortcomings, only extras.