I'd say the transmission is smoother, and the power delivery is more linear than the TRX. As most of the comparison tests have shown, the two trucks are pretty equal in speed depending on how you are racing (roll vs. from stationary). The R feels like a more tame/civilized truck than the TRX. i'm not saying that is good or bad. Just different. Still love the TRX. It's going to be interesting to see if I end up liking one more than the other. I think I might give the TRX a slight edge in interior finish. I need more seat time in the R though to be sure.