PTP, the most important thing you have to ask is which car is it easier to get parts for? If it is the same for both cars you might ask around to see what others are running, so you can ask around if you need some help with something. I have had both Mugen and Kyosho and when I ran Mugen I was just about the only one running it, which kind of sucked. Both cars are good, so you might want to look at other support things.