Galaxy games win this, hands down.
64 at its time, would have been the winner, but by todays standards? I think Galaxy takes it.
Its the best mario game(s) made.
my ranking would probably be like:
Galaxy > Galaxy 2 > 64 > Sunshine + 3D Land > 3D World
(havnt played Odyssey yet) (sunshine and 3D land, are pretty close, could basically be equal sign there instead)