Really Wii60 is the only answer.
360 currently has the best RPG line-up, with
Blue Dragon, Lost Odyssee, Eternal Sonata, Infinite Undiscovery, The Last Remnant, Tales of Vesperia, Star Ocean 4, Final Fantasy 13
Wii will have the more niche, but definitely worthy RPGs
Tales of Symphonia 2, New Tales, Arc Rise Fantasia, Fragile, Little Kings Story, Muramasa Demon Blade, Fire Emblem, Valhalla Knights
I don't expect the PS3 to have a lot of exclusives, simply because the 360 has proven to be a good system for RPGs.