if this is your first rc car i would say go with the RS4 3 RTR. this way you get almost everything needed to run the car.

if you have aftermarket servos or radio that you want to use with the nitro car then get the RS4 3 SS. its also great for you to learn where everything goes and you know exactly how to take it apart.

you due get a full manual with the RTR incase you do need to take it apart but with the SS your forced to build it.