I worked in a bike shop for 2 years (recently, so relevant). Only ever had one snapped chain and it was a Sram 9 speed (gold coloured, can’t remember the model number). Was on a fellow employee’s 4x bike and he snapped it during a crash mid-race. The magic link was ok, the chain snapped at an untouched link. The side plates were a bit twisted.
I snapped a 1070 recently but it was a freak shifting accident, I got the chain trapped and it twisted it at an untouched link again.
I’ve used Sedis chains since late 1992, then Sram chains since they bought Sachs. This is after my Shimano chain failed at the hardened pin during the national MTB Championships at Broxa, 7th August 1992! Never used Shimano since.