I'm also a FZ50 voter. It handles beatifully, if you understood that it's one of the heaviest cars in LFS, and still only has road super tyres.
Once you got that checked it's an absolute beauty on every track. It's so rewarding to balance it with the pedals, move weight to the front, move it back to the rear - if done well it's absolutely planted to the road and you can make full use of the rear-rear layout.
And it's damn good looking too.
Of course without TC or throttle blip on downshift. Only sissys use driving aids.
Oh, and there is no such fine moment as powering past an LX6 on the Kyoto National Oval part at over 50km/h speed difference. You can feel them trembling in your wake. (...And cursing you in the infield for being a moving obstacle
)
My second favorite car is the XRT. Again, a difficult car, but so much more rewarding than the other two TBO cars. Due to the STCC I spend quite a lot of time driving it. The rear-wheels-versus-turbocharger fight has something to it that keeps driving challenging even after thousands of laps.
Vain