The Wii.
The whole thing was so out there and exciting, it captured my imagination more than anything since the jump to 3D in the 90s.
Controlling a game with movement, swinging a sword or a tennis racquet or aiming Samus's arm cannon with my own arm, it was just so freaking cool.
Switch was pretty great too, but the portable aspect didn't appeal to me personally as much as motion control did.