I'd use Vpower. I used to use Momentum 99 until the moment I found out the way tesco get the 99 rating....With ethanol....They use normal fuel, add ethanol and get 99RON.
Shell make Vpower separately from it's normal fuels, it's a true 99RON fuel. Since switching to Vpower I've noticed smoother running and better response. Only downside is it's a little bit more expensive.