There are about RC 5 car types. I am not going to explain too much about each since they seem rather straightforward.
These are your average street cars. They are the fastest and the best on paved, flat surfaces. Do not get this if you are looking to drive in your backyard or want something with more power.
Drift cars are like on-road cars but with slick tires. You can slide around turns and still get almost as fast as an on-road car. They are good if regular cars bore you but you like to drive fast. Drifting is hard, however, so be warned.
Buggies are a cross between offroad and onroad cars. They are the second fastest on road but the slowest offroad usually due to their low wheelbase. Buggies are good for those who cant decide what type of car they want, since they can use it for both.
Truggies are also a crossover like buggies, but they are more for the offroad. It basically takes the frame of a Buggy and puts monster truck tires on it. These are the 3rd fastest on road and the 2nd slowest off.
Trucks are your monster trucks. They are amazing offroad but very slow onroad. They may flip a lot when trying to make high speed turns so these are not the best foron road and you should get these if you want to drive in the woods or in the grass the most.