I live in rural Oz, I changed my DR from 525 to 520 after reading about the conversion & also because my local suzuki bike shop didn't have a 525 chain in stock, neither did the bike shops in 2 neighbouring towns have a 525 in stock. But they all had a 520 in stock.
You'll find that you have a greater variety of sprocket sizes available for the 520 pitch chain.
But if your coming to Oz we have a local manufacturer here called Chaingang. They make any size sprocket for any bike, the sprocket wear longer than stock or other aftermarket sprockets.
As for rivet vs clip, I prefer clip links. They're easier to service (remove & replace) than a rivet joiner.
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