2015 Mustang GT or 2015 Mercedes C300? - 1

I will be getting a car for my 16th birthday, and I'm debating on which car I should buy. A 2015 Ford Mustang GT Premium, or a 2015 Mercedes C300? I'm aware that the two cars are in two completely different categories.
NOTE: I'll be adding aftermarket parts to the vehicle I purchase.2015 Mustang GT or 2015 Mercedes C300 - 2

2015 Mustang GT or 2015 Mercedes C300?

I will be getting a car soon, and I'm debating on which car I should get. A 2015 Ford Mustang GT Premium, or a 2015 Mercedes C300?

NOTE: I will be tuning the car that I buy with aftermarket parts.

I'm not sure, could you guys help me out?

Added (1). I'm also debating if I should use aftermarket parts on a Mercedes, which is brand new.
(I will be turning 16 soon!)

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