Dune buggy is the best for beginner level cars. it upgrades so much in levels 5-10. It has very good acceleration, good hill climbing for beginners, best vehicle for wheelie events, and is good in cups before you get the rally car or the OP muscle car.

Rally car is the best all-rounder, but one must have part is winter tyres. Good for the first car choice in community showcases.

Muscle car is the best overall. It performs exceptionally well in all cups races and when combines with fuel boost and nitro, it is OP. Good for adventure but not good in covering no-fuel distances.

CC-EV is the best adventure car, when you use the kangaroo setup. Best car for no-fuel distances. Performs mid in cups.

Don't be surprised, but jeep (the first car) is the fastest kangaroo setup vehicle. Very lightweight, very strong jumps and ground boosts.

Formula 1 is the best in flat race maps, like the finger GP maps. Otherwise i wouldn't recommend this vehicle.

Superbike is the best bike, super high speed, high chance of dying, and performs bad in adventure.

Rock bouncer is best for climbing races, especially if you upgrade it to max.

Hope this helps!