I'd take the MX-5 or GT86 on a tight and twisty mountain course, the Mustang, not so. Not that it's a bad car, it's a great car for the price. Without trying to insult anyone or anything, it's not a car which I'd do this touge-style driving in it. I personally wouldn't buy a Mustang if I were to buy a sports car for the cornes, that's what I'm trying to say. Though I've recently seen a video from a current Mustang GT on the Bilster Berg Driving Resort, which Walter Rh?rl himself called a Mini-Nordschleife, and it did fairly well to my surprise.
(and yes, I've driven all of them)
(and yes, I've driven all of them)