On-Road car advice?

The 10R5 is a 2 wheel drive pan car, where the TC 4/5 is an all wheel drive touring car. The the touring car would take bumps and uneven pavement better than the pan car. Both can be very fast in the right hands with the right setup (which is key). If you are looking for a touring car check out Corrally very nice stuff IMO, if you are going pan car check out the CRC Gen X 10 pro...I have one and its awesome, I use it for indoor carpet, but I hear they are great for outdoor as well.