Realy depends on how you want to drive it. If you want more of a lux cruiser to hit the freeways with and you have no desire to really floor the pedal very often, than go with the 5er. If you are more boy-racer at heart and will be flooring the car a lot and taking more twisties, than go with the m3.
They are cross shopped because they are the same/similar price so its not that odd of a comparo
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