I'm still deciding on whether should I use F50 or S-FR. They are both very easy to drive. S-FR has little bit better brakes and little bit faster cornering speed ( which is probably because it has less power ), but that can be seen mainly where you are coming through chicanes, where you can use full throttle. F50 is on the other hand faster on straights, I'd say even significantly faster, with only a little bit worse handling, but it's still handles very good. It also seems maybe a little bit more stable. And it might actually save tyres more, thanks to MR layout.