"Which car is fastest out of the three?" Thats easy. The one with the most powerful, best tuned engine, and the best driver!
It may sound as though I'm being a smart @ss, but really I'm not. I have seen a lot of press lately talking about how great and precedent setting the NTC3 is. But, for now at least, the Yokomo holds most of the top titles in the area of Nitro TCs. So I would say stick with what you've got. If it hasn't been bad for you, why switch?
Besides, everyone will soon have a NTC3, so why join the "just like them" club.
Stick with your Yokomo!