Shimano OEM quality chains unfairly get a bad rap.
Usually the breakage problem isn't the chain, or even the closure pin, but because these are often on the first bikes people own. That means they have a high proportion of newbie owners, who have not yet learned to shift properly. Newbies tend to shift too late, under too much load, and without lightening up the pedal pressure, all of which are death on chains.
Bye and bye, the chains break, and they get replaced, possibly along with a lesson in proper shifting. The new chains almost always do better than the originals, which shouldn't be a surprise since by that time the riders' skills are improved, reducing or eliminating the cause.
Which is just my way of telling you, that any decent chain won't break if you don't shift under excessive load, and give it decent care.
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Chain-L site
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