The KMC 'Missing Link' is intended to make your initial fitting simple by making it tool free, whereas the SRAM is intended to be opened/closed whenever it's needed. The KMC and SRAM links are more or less identical, but the KMC has a tiny ridge which stops the links opening up once they have been fitted and a different tolerance fit for the pin/plate interface. The KMC can be opened up like the SRAM link, but it usually requires a pair of pliers or grips to 'squeeze' the link plates together, not recommended.
I use the SRAM link on an XTR or KMC chain because it allows me to remove the chain without any hassle. I've never experienced any issues from opening the link regularly. I only use one link per chain, replacing it when I replace the chain.
sram quik links can be reused (reopened and closed actually) they dont recomend switching them from chain to chain (prob. because they wear out just like chains) However I take them off when I get a new chain and carry them for emergency trail use
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