The F30 front end is clearly better designed. The upper portions of the central U form flow nicely beneath the headlights.
Not so sure about the rear bumper on the F30; I would like to see it in the flesh before deciding.
As for the interior, the F30 instrument cluster has returned to a more traditional layout with four circular gauges. The aluminum trim, especially in the F30, will likely present reflection issues for those who choose this trim.
The F30 M Sport steering wheel looks fantastic !