I've never had a problem with shimano chains but prefer SRAM powerlink chains for ease of install. Upgrading to higher end chain (HG93, SRAM 991, etc) will get you a bit of weight savings. SRAM claims better shifting and more duability on higher end chains because,allegedly, nickel plating allows smoother shiftingsheds dirt better. I think thats basically marketing. Best route to durability is keeping the drive train clean and lubed properly. In addition to replacing chain, you should check your chain rings and cogs for wear. Worn rings will chew up a chain, and a new chain on old worn cogs won't shift properly. That said, you should get at least two chains worth of wear out of chain rings and cogs, assuming you have been riding a relatively clean drivetrain and haven't been riding a worn chain for a long period of time.