Choosing between the Whatsminer M66 276T whatsminer m66 vs antminer s21 and the popular Antminer S21 series is one of the biggest decisions Bitcoin miners face in 2026. Here’s a clear, honest comparison. Hash Rate & Performance • Whatsminer M66 276T: 276 TH/s • Antminer S21: Usually 200 TH/s (some variants higher) The M66 276T delivers signif