Turbo Optima is the best that I had, modified with belt drive.
I also love Boss Cat for next to no maintains other than the rubber band and tires! Back then, I did not how to respect the car and sold it for return of a grass hopper.......
Most memory - Tamiya Sand Scorcher
Most fun - Kyosho Gallop 4WDS
Maintains free - Yokomo YZ-834B
Jump Hightest - Hirobo Hilux 4WD
Most run time - Schmacher CAT XL with 64 pitch gear