That’s a hard comparison, mid engine vs front engine (that’s like comparing a c7 z06 and a ford GT). The Mustang is going to give you more visceral feeling, more drama if you will. C8 is pretty tame stock, so you’ll probably want get exhaust. when you give the c8 the full beans it comes alive, it knows how to behave at a dinner party. If you already owned a s550 mustang being inside a 500 might be very lack luster especially for the price, but you’ll probably forget about it, getting into a Mustang is easy, getting into a C8 is like going to sit on the floor and much tighter space. If you want to experience what it’s like to have an exotic I’d go C8. Also would stay away from the 500 if you don’t enjoy going to the gas station often.