Same opinion - I was in the London store today checking out black work, part time and velo and they all looked fantastic with RG. I think the GH is beautiful too but much more 'look at me'.
I Love the Black with GGH, Its just such a beautiful combo and stands out, I love the bling bling. Now that I have it I might consider getting a RGGH as my next target.
I think both look great! You can't really go wrong either way IMO. GGH has a dressier look I think, RGGH more casual. But both are beautiful. I think you should just think about how you'll be wearing bag...
I like the rose gold... It's subtle, sleek and vintage. You can still see the hardware. It doesn't get lost at all on a black bag. The gold is quite shiny. Also, the rose gold can go with gold and silver jewelry/watches since the it has the black vintage look