Personally, I prefer Xbox's Aavatar's, there's so much more to them. But with the Wii Mii's you can create yourself more accurately, with the Wii Mii's you can change most of the facial feature settings, but with the Xbox Avatar's there are a lot more accessories and just a lot more to play around with in general. So if you're looking for a more accurate duplicate of yourself in the gaming world, go with the Wii Mii, but just to mess around with a character and put accessories and different clothing styles and looks, go with the Xbox Avatars.
I would say miis for originality since avatars are a ripoff of miis, and designing, because you can twist, turn, and scale eyes, nose, mouth, ect.. I say avatars for more stuff like accessories.
Mii's might have originallity but they look ugly as mess. I say Avatars because they can look pretty awesome, also you can always unlock and buy tons of outfits for them, unlike Mii's who are stuck with like 8 different colors of shirts and maybe a stupid looking hat.
mii's was a good concept, but totally failed. Avatars took that concept and totally made it awesome. So props for mii's for giving the blueprints, but major props to Microsoft for making Avatars seriously badass, even putting them in higher quality games than the miis were in!
i would have 2 say....mii's.Because you actually use them.I mean idk u might use avatars 4 the xbox but idk.and u hit more accuartyly [or whatever]with the mii's because the avatars,well you kno[2 many stuff 4 ur person]the BIG reason why i choose mii is because i have a wii.NOT A XBOX360.LOL
If I could make Konata from Lucky Star, Judge Joe Brown, and other people from Nintendo's Mii channel while I can't do crap with the Avatars in Xbox, then probably Mii wins by a landslide.