Decided to test this in depth. The bump height of Cheetah/Turismo is about the same, but the Cheetah has a slightly more consistent front side than the Turismo, because the left/right of the Turismo's front side are very slightly raised. However, the Turismo has a slightly higher top speed than the Cheetah, and accelerates much faster, which allows you to get more height off it for multiplayer bumps.
Both vehicles work fine, but after doing a lot of in depth testing, I'd give the edge to the Turismo. Cheetah can be very slightly easier to bump at times, but it's not worth it over the speed advantages of the Turismo. If you want to keep both, use the Cheetah for placing a ramped car in front of a bump, and use the Turismo for motorbike multiplayer bumping. For multiplayer bumping with BMX's and cars, the Zentorno is still the king.