I can only speak of diesels...having owned a 3 Series and an E Class (the E Class for a month).In short,my MB diesel is more "refined" than the BMW's (though that wasn't at all "unrefined") and the BMW's had more punch.
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Current : 2018 540d
Formerly: 2014 328d
Formerly: 2011 MB E350 Bluetec
Formerly: 2009 335d
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