I think it depends on a few things, like what years are the bags from? If one is a more desirable year and leather then that would definitely influence your choice. Are they in about the same condition? Any torn corners or sticky handles?
For me personally you can always get RH, so while I like it the RH isn't a must for me. GH (if it's G21, not G12) is harder to find, especially if it's GGH (gold) which is tough to find on black city bags (that aren't beat up or fake). If having something rare and hard to find is important to you then you should definitely consider the GH (G21 silver however is not as rare, I see it everywhere). However always decide on what feels best to you. I personally don't find G21 too heavy but I know some people do.