A question of tastes, colors, budget.... and application my friend.
On our semi permanent track, with Rubber Tyre Only Class, unprepared surface, and very technical tight design, mixed with a 55 mts main straight, our STS engines are as fast than any Italian mill and any TZ engine...it's a question of who sets his car best, and who drives more smoothly....raw power dosn't win races if you can't put all the power on the track.
All modern high end engines are created equal..... if you know how to tune them properly and take advantage of their strenghts and weaknesses.

AFM