I would take a 997 in any road course. American Muscle are fun to listen to and watch do massive burnouts, but as far as driving experience, fit and finish, looks, and simply all around performance I think Europe takes it in this one.
And what exactly do you mean "lacking" in the quarter mile? I dont think a 500hp, AWD Lamborghini is going to be running poor times.
As far as affordability, there is no argument that Euro exotics cant even compete to the value of american muscle. But in the end, if you are trying to use that as a comparison, you cant really call this a legitimate contest, as they are in totally different categories.