I was in the same spot two months ago and built a full spreadsheet to help decide. The key is to go beyond just hash rate and look at power efficiency, cooling type, noise, size, and even firmware stability. For a solid bitcoin miner comparison 2025 https://captainaltcoin.com/best-bitcoin-miners-in-2025-comparison-prices-and-expert-insights/ I looked at units like the Antminer S21, WhatsMiner M60S, and iBeLink BM-S3. What stood out was how the M60S gave me the best balance—lower energy use per Th/s and less heat stress on my setup. The S21 pushed more power, but my cooling couldn’t keep up and it throttled after long runs. BM-S3 was good for learning and budget use but not competitive for long-term profit. Build a table and run monthly ROI projections—it’ll make your choice much easier.