Since the ruling of only using GBS approved bodies this year your choices are limited.
For foam, the only 2 approved are the parma mohawk and Protoform R9-F, to me the mohawk has a more planted overall feel, where as the R9 steers a little more.
For rubber there are Mazda 6, Mazda Speed 6, and R9-R, and now the LTC-R which just got released. The speed 6 is by far the most popular, it has excellent balance of steering and rotation, the regular 6 will be more stable, and the R9 will be more aggressive. (*I have not actually run an R9-R myself, but have the others). The LTC-R is supposed to be a little better than the speed 6, we will see.
The bodies do make a difference, but it may take a while getting used to driving a TC before you can tell, over driving as most do at first will negate the small differences.
Mike L. Awesomatixusa.com | TQWire.com | Islandraceway.com |JacksonRCracing.com | Horsham RC | Sweepracingusa.com