One thing I am surprised has not been touched on is the general stigma attached to the GTR. I was looking at the GTR but need something more professional looking to drive to the office. The M3 seems to check that box for me.
I also already have a caged Nissan track car albeit a bit older.... So I really wanted something more comfy and easier to live with as a daily driver than the GTR since my daily would never see the track.
If money was no object I would get both the m3 and the GTR and just drive the GTR on weekends and at the track!