IMHO, Evos all suck some degree of ass.
The rally prototype car is the best, but even as far as rally cars go, they arent that great, as they have to comply with WRC regulations. (Most all of the WRC spec cars in GT3 weigh the same, 1230 kg) Let me loose with my FTO LM, and I'll smoke a whole pack of EVOs. But I digress.
If you need to win the EVO cup, use the evo prototype rally car.