Kmc easy win. Light strong easy to install and shift well and last longest. Shimano snap and have a stupid pin joint system. Expensive Sram heavy. poor shifting, poor wear rate .
So I'm guessing that at 61kg I'm probably never going to break a KMC chain then. The only chain I've ever had break on me was a brand new xt chain, but that could have been the installation from the LBS.
i went through a full set of shimano chains in a couple of months (broke an HG53, then a 73, then an XT and got given an XTR, snapped that twice and gave up on them all together, all breakages were fixed with sram powerlinks) broke two PC-971s, bought a KMC Z9900 and ran it trouble free for three years on two cassettes then replaced it due to wear currently running X10G and L model 10 speed ones and yet to skip a beat on them
When i am using shimano chain, i am using kmc link connection. It will make it easier fo me if i want to clean my drivetrain and it will eliminate the possibility wrong instalation.