I use these 4 about the same. Grand Marshal - With my undercover custom config Sunburst - Race or rally ETK S Series - The default config Old Pessima - rally config
I use a custom config of the Legran that I spent a few days tuning (set as my default vehicle). Now its a few seconds faster than a Sunburst RS around Hirochi Raceway. Other than that I use the Moonhawk and occasionally the beater Covet.
Stock vehicle: Green D-series. Mod vehicle: A russian Mustang mod that I (and a few other people) are improving.
Offroad/Rally Sunburst (my default) - for exploring Custom tuned SBR4 - for racing Offroad Burnside Special - for offroading
Easily the Moonhawk. It can be anything from a beater I6 to a sporty, supercharged V8. And you can offroad it, if you know what your doing
practically every top of the line street version of each vehicle with a few exemptions. (pigeon, 1996 pessima mostly not used)