There is nothing wrong with the question but Z guys will be more partial to the 370Z. I'm sure if the same question was asked on a G37 forum then the responses would most likely be in favor of the G.
I've checked out both but the G didn't nothing for me, it's not what I'm looking for in a car. Although I haven't actually bought my 370Z yet it will most likely be my next purchase. Hopefully by next year.