Mario Kart Wii is the real MKW.
And it's fucking perfect.
Why spend $500 on a console and $80 on a game just to play Mario Kart? Even if you have the console, Nintendo can decide to brick it if you dare commit such SINS as... modding it to get more freedom and control over it.
You can play Mario Kart Wii on a much less expensive Wii, plus you can emulate it on Windows, macOS, Linux, or even Android! Yes, you can play Mario Kart Wii on your phone. Hell, even a fucking potato could probably play this game.
Mario Kart World has 30 tracks that look like a drive to work. Mario Kart Wii has 32 tracks, plus 200+ extra ones if you get CTGP Revolution, which can be done by modding your console. Insane Kart Wii v2 adds over 4800 tracks. You can even make your own tracks!
The fact that Mario Kart Wii has been around for 16 years and people are still actively making discoveries in it really speaks to how great it is.
In conclusion, Mario Kart Wii is the path to enlightenment. Mario Kart World was placed by Nintendo to tempt you. Choose wisely.