They are both really beautiful. I like both, but if I had to choose, I think that I would pick the GSH. I have to admit that the GSH is growing on me more and more.
It's not just the pic--my GSH really is boxier than my RH bag. The GSH City measures 10" h X 14" w and the RH City measures 9" h X 14" w. My RH is my favorite bag of all time. I like the GSH too, but it's heavier and not as comfortable to carry.
Good luck with your decision. You can't go wrong with a black B-bag!