The deciding factor here is that the Mercedes-AMG GT C is over $100,000 less expensive than the Aston Martin DB11 Volante. The cars' 0-60mph times both come it at about four seconds (the AMG GT is hair faster). The Aston is smoother handling, and the its exhaust note is more thrilling, but not $100,000 more thrilling.
But the Aston has mountains of cool. We're talking about James Bond's car here. Inside and out, the DB11 Volante exudes quality, style — and more quality and style. It makes the Mercedes seem uncouth by comparison. And the AMG GT C is a bit rough. Mercedes has come up with a tweener here: half GT car, half sports car, and the sports car half wins out when it comes to the firm suspension and harsh brakes.
So if I want to feel quite special and also enjoy a softer ride at high speed, then it's gonna be an Aston DB11 for me.
But for spirited driving and a quintessential front-engine, rear-wheel drive experience, I would be happy with the AMG GT. Now obviously, I could cross shop with an Aston Martin V8 Vantage, which is notably less pricey than the DB11. But for this comparison, I'm looking at vehicles I've recently driven that are in the upper reaches of the GT segment.
Even if money were no object, I think I'd choose the the Mercedes-AMG. But I'd still dream about the Aston DB11 — while also dreaming about the $100,000 I didn't spend.