Different people have had different experiences with all kinds of fuel. This question could easily be turned into another Revo vs Savage, or Chevy vs ford Type debate.

Try to stick with the quality fuels (Odonnels, Trinity, White Lightning, Maxy's, etc...) and I would recommend at least 30% Nitro. That's just my opinion, but the performance you gain with the higher Nitro is very noticable.