In reply to Mat S:
I have been to KK a fair few times over the years, RR just once, a year or two back, it might be set differently now, I wouldn't know.
RR is more spacious, had loads of easy to moderate problems. Pleasant. Probably better ventilated of the two.
KK is less extensive, but has one properly steep wall with harder problems.
So it depends on what you are looking for. KK is better for training if you climb >V7, but it's hard to compare having only visited RR once. Next time in Cam I will go to KK.
Post edited at 15:35