It will sell best on 360 without a doubt. It won't even be close, perhaps somewhere inbetween 2.5/1 and 4/1 over the next best. The only userbase that matters is in the USA, and 360 will have a huge userbase advantage over wii and PS3, and I think 360 has a bit of a demographics advantage over PS3 for this game too. PS3 is gonna have better considerably better demographics for this game than the Wii, but the Wii will have a much larger userbase and the wii version has its own special features and this time around it will include online. Considering the Wii one nearly outsold the PS3 one (dont' have exact numbers, but i remember it being within 50k), and the userbase is now a huge advantage and this version is much better than the previous on Wii so i expect the Wii version to outsell the PS3 one.
I forgot, the PS2 version will outsell all of them.
currently playing: Skyward Sword, Mario Sunshine, Xenoblade Chronicles X
