7 on the 3DS is really good and the one I've played the most (specifically for online multiplayer). Unfortunately the buttons on my 3DS decided to break on me, so if I want my Mario Kart fix, it'll have to be 64 on an emulator. My sister has 8 on the Switch, and it's pretty cool. Would be something I would own if I was desperate enough to get a Switch.
Regarding other racers, WipeOut and Wip3out on PS1 are games I've played constantly and are really fun. The soundtrack on those games are fucking amazing too. CoLD SToRAGE and DJ Sasha became my favorite artists because of those games.
Cruis'N World is another fun one. Playing Championship mode while getting enough points to upgrade your car and give it a new paint job is fun. Also as someone that live in NY, it does a somewhat decent job at representing it. The stage kinda looks like a certain part of Grand Central Parkway, but it could also be somewhere in the Brooklyn like the BQE near Sackett Street.
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Also I'm probably the only one that unironically likes Sonic R... both the game and soundtrack.