I shall now rank the 1st/2nd party Wii and GC games I have to my preferences.... which won't prove much about the answer the OP wants, but may at least throw something into the gears of this whole casual/hardcore shit.
LoZ: WindWaker
Mario Kart Wii
Wii Sports
Endless Ocean
Wave Race: Blue Storm
Battalion Wars II
Super Mario Galaxy
Metroid Prime 3
Eternal Darkness
LoZ: Twilight Princess
F-Zero GX
Mario Kart:DD
Excite Truck
Chibi-Robo
Wii Play
Not including Wiiware or VC in this either... something a lot seem to forget about.
In general I have enjoyed Nintendo's Wii games more than I did their GC games.... and *shock* the top of this list has "casual" games like Wii Sports and Endless Ocean.... and I am guessing as you ignored MK in the first post you deem that casual too? either way, the Wii version is the better game for me (don't get me wrong though, I enjoyed ALL of them thouroughly)
Zelda is one thing I preferred on the GameCube, Windwaker is still the king to me, but it's not like Nintendo is leaving the Wii's selection of Zelda as it is, it may be a year or two from release but there is another Zelda coming.... I would also like at least 1 more decent racing game as well, but it's not as if the Wii is at the end of it's life.
