What is the best ASIC miner for those with an energy cost of $0.20 KW/h?
Short answer: None
Long answer: ever since mining took a huge shift from being a hobby thing to an actual business, which was probably the S7 era going into the S9 ear, so say to 2016 onwards, 20 cents KwH was never competitive, in 2016 and maybe all the way to 2020, you could still make some good profit with 10 cents power, you probably didn't even need the most efficient gear, fast forward to today's world, anything above 6-7 cents is not going to work, it doesn't matter what gear you use or what setup there is.
Obviously, I am talking about Bitcoin mining and not the other coins, I would be very careful when examining the profitability of alt miners, the difficulty on most of those coins with the expectation that probably only LTC can double in a few days, you can easily examine that buy getting a clue of the total market cap of that hashpower, you would need tens of billions of dollars to double the hashrate of BTC, so you know your profit isn't going to be cut to half the next month, it's physically not possible, on the other hand, for some new coins, the value of the hashrate is just a few million dollars, so all it takes for the difficulty to do 1x or 10x is one large batch from Bitmain, so all those 50$/day miners and the likes of it are just fake, by the time you get the miner, that 50$ drops to 5$ and the rest is history.
