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I mean put 1 miner on another pool for a week or 2 just to test its returns against all your other miners in another pool.
Can do a comparison on returns then
Your missing my point: All pools have random luck. That luck averages out over a period of something like 250-1000 blocks to approximately 100% - as expected. Using the optimistic 250 number, if your Slushpool and find a dozen blocks a day, that is 20 days. If your Kano and find a block every couple of days, that is something like 500-750 days.
You CAN NOT compare returns over a period of a week or two and have a statistically valid result.
What you can do is run the math and figure out which will pay out better over a year or so.
What he said. It's not about the returns today, it's the returns over a longer period of time.