What kind of hardware do you prefer? If you want RH, I have seen both and I would prefer the Noix in RH. If you want GGH then both bags are stunning in that combination and then I'd choose based on your wardrobe. Galet is a taupe/gray color with brown undertones while Noix is definitely more brown, but not too dark and with almost pink like undertones.
If you want silver hardware, I think I would chose Noix a there is more contrast between the silver hardware and the Noix than the Galet. Just my opinion, of course.