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I agree with most of your points except 2!
I find the technology in the M3 to be more advanced and easier to use. The Command system in C classes are a bit difficult to use and the navigation is pretty bad.
Second would be the engine, the C63 has an engine that suits it perfectly, more of a muscle car vibe. The M3 might have less torque but that is nicely suited for cornering, it is smaller and lighter. The engine has such a smooth torque curve that it does not upset the rear axle when exiting a corner while accelerating. The M3's engine would definitely not match a C63's personality and vice versa. I would say they are dead even when it comes to the engine (just depends on what you use the car for).
I drive a C63 very often and love it, would love to own both ideally!
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