Has that not got to do with the harder suspension on the Griff? Will make them fidgity over bumpy roads. Not sure if the 500's got the same set up, but I thought it was slightly softer.
When it suits the Chim camp they are the same cars. All I can say is he must be doing something wrong, or that Griff needs sorting. (Or does this prove Griffs are more of a beast.) Did I just say Chim camp?
It may or may not be the case but let's be honest you can't get away from the fact that one looks like TVR's take on an MGB and the other the love child of a D-Type Jaguar and an AC Cobra! I know which I prefer.