It seemed like the genesis was somewhere in the 40mph range +/- a little. I'm not big on Cen due to my experience with one of their nitro cars and parts issues. I own a LST and so far, it's been great. I've had a few issues, but Team Losi came through and sent the parts no questions asked. It comes with a nice radio and it's been loads of fun. I have not had any of the a-arm problems others are having. It seems to hold up well to the abuse I give it. However, I do not try to destroy it. I just can't bring myself to slam a $600 toy into trees, or launch it off of rooftops. Now that I have a Vid capture card, I'm going to try and shoot some video of it when it warms up and post em ......... OOps, I'm drifting off topic...
Out of the two manufacturers you have listed, I'm more satisfied with the Team Losi experience.