It'll be more fun on Wii with the wiimote.
Graphically in a game like this, does it even matter any?
Sega games have been very popular on the Wii so far.
Also Wii has an advantage with Monkey Balls, Nights, Samba de Amigo, House of the Dead all being Wii exclusive so more Wii owners will be familiar with those characters than casual 360/PS3 owners.
This game will be huge in Others.