Had the same issue with the first gen U80-A. Was really difficult to decide. Went with Moon in the end.
Moon is a darker medium grey, I’d say. Fits perfectly to any dolch-ish keycap set like MT3 Susuwatari. See a picture of mine over in the What did you get in the mail today? thread.
But Kuro is nice, too. In case I ever buy a second one, I’d probably go for a Kuro. 