The 5-series is about 150kg heavier, or about 3 of your standard issue concubines plus their handbags inside if you are driving a 3-series. However the 5-er does have an 8-speed transmission if you get the auto which is significantly better than the 6-speed auto in the 3-er.
Overall, if you are getting the manual I'd go for the 320d SE or the 520 if you are getting an auto. Can't comment on Audis.
I'd never get an M-sport if I was cost limited, there are other far more useful uses for the cash, like leather seats or a sunroof.
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