I've test driven both recently and if you're looking for comfort and quick off the line and GT type car I would go with the Mercedes. It's a typical Mercedes, car felt solid and handling was decent. Fit and finish of the car was great. The S5 is a joke and I personally wouldn't even consider one. It is a beautiful car both inside and out but when I was driving it, it felt like driving a toyota. The interior was beautiful but the materials felt cheap. The steering was looser than my girlfriend and as disconnected to the road as I am with her. In terms of performance, the M3 is better than both hands down. But go test drive both of them and see which one you like, everyone has a different perference in cars.
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