Been looking into Bitcoin mining rigs lately and honestly there's a lot of options out there. The market's still dominated by Bitmain and MicroBT, but what's interesting is how the specs have evolved. Bitcoin's around 55-56% of the market now, so if you're gonna mine something, might as well go for the biggest one.

The thing about finding the best crypto miner is it really depends on your setup and budget. Like, the S23 Hyd looks insane on paper - 580 TH/s, super efficient at 9.5 J/TH with that liquid cooling tech. But it's also $17k+, so that's heavy for most people. If you're looking for something more reasonable, the S21 is getting a lot of attention. Around $5k, 200 TH/s, and people say it actually performs better than the older S19 series despite costing less. That's the kind of best crypto miner move you want.

MicroBT's M50S is another solid pick if you don't want to go all-in on Bitmain. 127 TH/s at like $2k-ish, decent efficiency. The older S19 XP still slaps too - 141 TH/s, around $3-4k, and the power consumption is surprisingly good. Even Canaan's A1466 is worth considering now, though it's not quite at the level of the top dogs yet.

Honestly the payback period matters more than raw power for most people. You're looking at 6-12 months if electricity costs are reasonable. Electricity's the real factor though - U.S. rates around 16-17 cents per kWh can really eat into margins. The best crypto miner for you depends on your local power costs and how much you want to spend upfront. If you've got cheap electricity and capital to burn, go for the M63S (406+ TH/s). If not, something like the S21 or M50S gives you better bang for buck.

Mining difficulty adjusts every two weeks, so you gotta monitor that. And yeah, mobile phone mining isn't realistic anymore - you need actual ASIC hardware now. The game's changed completely from the old GPU days.