I'll tell you one thing: MK8 requires TONS more teamwork than Sm4sh. You can't simply assume that it requires little to no teamwork if you have no experience in war and even less in the mario kart community whatsoever. I could get SEVERAL people from the mario kart community to back me up. And don't even pull the "you don't have experience in the smash community", because I do. In case you are wondering what competitive mario kart looks like(since none of you know), here is a good example:
You have to worry about not hitting your teammate(which is all smash bros it), you have to plan lightnings + stars/bullets, and planning when to use items. But if it was a bunch of smashboards people playing, they wouldn't even be using items lol