Most corded clippers, like the Wahl Sterling Clipper, include electromagnetic motors, which are faster but have less torque. On the other hand, a majority of cordless clippers like the Wahl Detailer have rotary motors, which have higher torque but slower speed. Contrary to popular belief, cordless clippers have better cutting power (torque) because of their rotary motors. It only struggles to cut, though, when you try to move too quickly. Conversely, corded clippers have motors that generate higher speed (rpm) to make up for their lower cutting power. At this premium level, the ergonomics and convenience offered by these clippers should be more of a concern than their power. In the end, they all cut hair in very much the same way.