I don't know, I kinda like Wii a little better. Mario Kart Wii felt overall more like Mario Kart 64, as you can take short cuts and glitches a lot easier then you can in Mario Kart Double Dash.
I do however think Mario Kart DD was a very well made game, probably my second favorite. but tbh, I think Mario Kart 8 will soon be my favorite :D