Kinda odd and hard to compare unless someone here owns both. Other than that, I'm pretty sure most of us own a 370z only and only test driving a "smidge" with the BMW Z4. You get the same result vice versa if you go to a Z4 forum as well.
I'll tell you what I told everyone else, test drive both of them and see WHAT YOU LIKE MORE.
Of course the only other thing is maintenance is cheaper on the Nissan...but you don't get the 'OMG ITZ A BMW" factor with the ladies.
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