I use one of the two pin elongation gauges. If it fails the first (.75) test I toss the chain to avoid wearing the cassette and chainrings. I would say I get 2000-3000 miles out of KMC chains with minimal maintenance. I don’t believe in the taking the chain to the spa treatment with fancy time consuming cleaning methods. I will soak it in chain lube and run it through a towel by turning the cranks. YMMV, but to answer the question, the gold KMC chains seem to last the longest. Also fwiw I cross chain frequently and will ride in the wet.
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