Super Mario 3D World is the first 3D Mario that I've played. It was slightly difficult to figure out the controls since I've never played a 3D Mario before. However, once I got the hang of the controls, it didn't take long, it was really fun to play, especially with two buddies of mine. As for Mario Kart 8, well I ended up buying the Mario Kart Wii U bundle and I'm so glad I did. The controls were easy to learn and the kart customization is fun to play around with. So, with that in mind I have the give my vote to Mario Kart 8. I love me some Mario Kart!! I have to say that I love both and I'm glad that I bought both of them.