I would definitely say get the Clocked 25xz because I like mine so much and it has served me very well...But, for selfish reasons I hope you get the Clocked Bonito because is looks like a beast in the videos and I am dying to line my 25 up against one to see whats up on the track... Only because im kicking around the idea of getting one too Those are the only two engines on the planet occupying space in my brain! As far as my Clocked 25 goes though, I can honestly say that I have not ran against another engine that has been able to out pull or out muscle my Clocked 25! Not on the straights and not out of the turns! But, I have met a few racers who can outdrive me lol..