i think that there is no point trying to ask which is better because both these games have there own charm since one is biking and the other one has cars...................i personally like both of them
If I had them both in front of me right now at this moment I would 100% no matter what go for road rash. I miss that game so much. NFS is also a great game and I like all of the need for speeds but nothing beats road rash.