Originally Posted by rcbuggy88

There are 17.5T outlaw motors which will likely be faster than a roar approved.

On your list, The ICON V2 and X-factor are the better of the two, S+ being third and Maclan being last (their motors are a little lacking at the moment).
The thing I don't like about Fantom and Trinity is they bin their motors, so all the better ones are more expensive and not really worth it.

The ICON V2 is new so untested

The X-factor is good, but in hard hits, people say the can bends due to the cutouts in the front.

Although I haven't gotten a chance to try it, I just bought a new Actinium V4 17.5 motor after it basically won every single class at the last club race I went to. Its got a giant cnc machined collector which is probably the most obvious difference but taking it apart, there so much attention to detail. The screws are already aluminum so no need to upgrade. The insulation plates are made of a black plastic instead of the white paper on most motors. And there's even insulation for the sensor board which I've never seen a motor have. I put my motor on one of those skyrc motor testers, and the sensor was 30-30-31 which is darn near perfect. Midse from this forum posted a picture where he got like under 0.5 error for his motor so really incredible (R1 in their hand-aligned boards only guarantees a 2 degree difference which Team Powers already beats with their non-upgraded motors). Oh and there's only one version, so you don't have to worry that someone has a better motor because they paid more.

The Team Powers customer service is also very good, they've always been able to answer all my questions.