Sedan - you said you like it yourself.
So do I. The sedan just looks meaner, to me.
Either way, be careful as being 18 and a car full of buddies can lead to bad decisions. Not saying you would, but remember.
2012 135i E82 MSport 6MT Jet Black
Previous BMWs - 2012 135i MSport LMB DCT(sold), 2011 X3 35i MSport VR (sold), 2009 M3 Sedan AW (sold), 2008 535xi MSport AW (sold), 2007 328xiT Barbera (sold), plus 11 others in the 70s & 80s.