This is hilarious, I'm currently in the process of checking out both these cars (as CPO), with plans of also looking at the 328, and Lexus IS (other than styling, this car is the last on my list of interest). I've only had the opportunity to test the G37, I was pretty impressed with it's demeanor, especially it's acceleration for an auto V6. I was planning on checking out the Bimmers this weekend. At this point, I'm a little skeptical about maintenance (only based on hear-say, not experience), but I refuse to rule the 3 series out of the equation. As I see it, better car and better buy are rather subjective. From most of the reports I've seen, the G sedan is the better buy, however the Bimmer is the better car.