Being a spec class and motor, they should all be about the same.
Although, I have heard the Matrix tuned Reedy based motor is quite good. I personally use a Chameleon 2 and it is just fine. I actually use it for mod truck as one of the tracks I run on the track I run at is not that big.
In the end, it's probably more about the actual numbers of the motor and how much attention and time you put into it ie brushes, springs, zapping, aligning, cutting, balancing, cleaning, oiling, massaging, resting, talking to, quality time, dinners, how much alone time it gets, whether you let it have a career of its own, loving, but not smothering, counseling...you get the picture!