Grip-to-weight ratio

If you have ever seen MF Ghost, you know that one of the rules has been this, the grip to weight ratio, which uses the weight of the car to designate the tire width of the car

With this rule, which car would be the best choice for these races and why? Cuz it's obvious The Cayman and the GT86 would easily lose to most cars on the anime, and somehow, Beckenbauer and Kanata are pushing it way above it's assumed limits