It's personal.
Look at the leaderboards if you want the 'best' car. But don't expect miracles if you don't learn how it drives.
My favourite gr4 car (not the Nissan...) is a dream to drive. I've done hundreds of laps of kytoto this week and, while I'm still 2 seconds of the track record (Scirocco) I love driving my choice car.
I'm always the top car that isn't a GTR or Scirocco and it feels better than just picking the meta car and being like this everyone else.