I've been running a Sram 830 on my 9 - speed xtr. Main rub point is when in small chainring and second biggest cog. The chain rubs on biggest cog a bit but hasn't snagged or ghost shifted yet.

Went to the 830 after snapping a KMC 9.93, IIRC.

Got a Sram 9sp chain but dunno if I'll use it on this bike, since the 830 works so well.