I know the question is meant differently, but to me ”the best“ is a highly unusual suspect.
In fact, recently, I had the most fun in the Weds Celica. In my opinion, that car is terribly underrated. Sure, it’s heavy as a boat. But, it’s one of the most neutral handling cars in the whole game, since it allows for mid corner corrections via throttle like very few others.
It’s also a great car to step up your game. If you’re kind of in the middle of getting to know the game, the Celica strikes me as the perfect tool to learn the proper lines.
Just take it to the GT300 and try to improve lap by lap. In the end, it’s so much more rewarding, having to struggle first and finally master a challenge, which unfortunately is very rarely the case in GT2.