I don't think the DC2R will be faster on the track than an RX-8.

The tighter the track the more advantage to the RWD RX-8.

Funnily enough if it has really long corners, especially uphill ones, it will also suit the RX-8 or S2000 more.

Both are easy cars to drive however. The chassis is better than its power level and neutrality.

Which one will I buy? The DC2R. IMHO I don't think the RX-8 has enough power for its chassis. Whereas any more power in the DC2R than stock it would have too much torque for a FWD to handle.