Vive Pro will probably be one of the best, but isn't out yet and will be very expensive.
The Rift has a better apparent resolution than most of the other headsets, and less screen-door effect than the original Vive, but requires external sensors plugged into USB3. On the plus side it's one of the most comfortable and lightweight headsets and has excellent built-in audio.
Any of the mixed reality headsets would be ok for driving games, with the bonus that they are easier to setup (no external sensors), but the comfort, image quality and lenses are not as good as the Rift or Vive in general, plus they do not have built-in audio. The Samsung headset is the best of the WMR, and includes built-in headphones, but isn't officially released in Europe.
As a Rift owner I'd recommend the Rift, but I'm biased.
The touch controllers are amazing, and even though you're mainly sim racing, once you've experienced the touch controllers in VR you may want to try some other game types too
I sim race on mine, as well as play elite using a hotas, and use the touch controllers for lots of games.