Should I buy a manual or self-adjusting wire stripper?

Manual strippers (like the Klein 11055EP) give precise, gauge-specific control and are favored by many tradespeople for solid Romex wire, while self-adjusting/automatic models (Klein 11061, Knipex 12 62 180) grip and strip in one squeeze and are faster for mixed gauges. If you work with a narrow range of wire sizes, manual is often cleaner; if you handle many gauges quickly, automatic wins on speed.