I have used a KMC Z chain, and it wore out, stretch if I can say that, in a year with all my 100 watts of power.... brand new cassette and crank too.
I use the KMC 8.93 chains, half nickel plated, and they last. Good price, best value.
Have also used 9 speed chain on 8 speed, put the front shifting was touchy, chain would skate on the smaller ring if I didn't shift it right.
SRAM seems good. But push a pin out of a SRAM chain and then do the same on a KMC mushroom pinned chain, and you will know which is better.