I really love MK8/Deluxe but I think overall I had so many fond memories playing Double Dash. MKWii is a close call also. It'll be nice to see what MK Tour brings to the table.
I really wish I could get into the original SNES Super Mario Kart game but I find the controls to be so frustrating. Maybe it's because I'm not used to using the D-pad plus, it's 2D.