Right now my favorite is the TC3. I had and Evo3 and it had too many issues and it didn't perform the way I wanted it to. I hated to modify the car just so I could run foam tires without rubbing issues. I will never again buy a car that was not made with foam tires in mind.
As for the rest of the shaft driven cars, I am very glad that the market is getting flooded with new sedans because hopefully this will mean greater numbers will result in cheaper prices and more competitive sedans available for all racers. Everyone has their own preferences but in the end most of the cars out there are very competitive. I am interested in possibly trying the new R2 when they become available, the Yoke looks great and will definitely look forward to checking out the new shaft driven X-Ray that will be coming out late this year.