Hands down the F. I have owned mine for almost 2 months. This is a very special car indeed. I disagree with some regarding the styling: I think it is a beautiful car - very masculine looking. The M3 is overly designed, typical for a BMW of the past 10 years or so. Have you sat in the M? What kind of an interior is that? So basic looking - don't like anything about it. The F has the best interior in its class (some materials could be improved, though). The F is unique and rare - no one knows what it is and that's fine by me.
2009 IS-F
2007 E63
2009 IS-F
2007 E63