In reply to gethin_allen:
I have used SRAM previously on 9 speed although I have been 10 speed for a year or two and for the considerable future.
I actually found the SRAM chains quite noisy and clunky on the 9 speed.
I find no problems with the KMC with regard to picking up loads of crud, but then I do keep my bike quite clean and use white lightning epic as a lube which 'cleans' the chain so that you just apply more lube.