NSX with Short ratio and Stage 3 Turbo covers most tracks as one of the best cars and is best on 2-3 tarmac tracks (with tarmac upgrades) and 2 dirt tracks (with dirt upgrades) unless something changed, so I'd suggest starting with SR T3 Tarmac NSX and go from there
I think SR T2 Tarmac NSX is best for another 2 tracks, but I haven't build that one yet as I'm trying to get 250 wins done on the first NSX.
[image: cdn.discordapp.com]Looking at my stats, the Dirt NSX is a real beast, using it on all dirt tracks (but I've been skipping mudpit for most part) and still have 1/3 win rate
The Tarmac one has been used on all tracks including dirt till I built the Dirt one, I'm using it on all tarmac tracks, so the winrate is abysmal, but every race is a chance to get closer to 250 wins, even if it's a wrong track.