Power and reliability
Traditionally, corded clippers won on raw power. Drawing constant mains electricity, they deliver full strength from the first stroke to the last with no battery to fade, which makes them the dependable choice for thick, coarse hair and long haircuts. Our best overall pick, the corded Wahl Elite Pro, is a good example: it simply does not weaken, no matter how demanding the hair or how long the session.
Cordless clippers have closed much of this gap. The best modern sets hold near-full power until the battery is almost empty, so they no longer trail off mid-cut the way cheap cordless clippers once did. For the very thickest hair and the longest, heaviest sessions a strong corded clipper still has a slight edge, but for everyday and even fairly thick hair, a good cordless set is now more than powerful enough. The key word is "good": it is the budget cordless clippers, not cordless as a whole, that struggle with power.
Convenience and cutting your own hair
This is where cordless clippers pull clearly ahead. Without a trailing lead you can move freely, work at any angle, and reach round the back of your own head, which makes an enormous difference when you are cutting blind in a mirror. For self-cuts in particular, a cordless clipper is far easier and less frustrating than fighting a cord. It is also more convenient for quick touch-ups, since you can grab it and go without finding a socket. Our guide to cutting your own hair assumes you will appreciate that freedom.
A corded clipper, by contrast, ties you to a power point and a length of cable. When you are cutting someone else's hair while they sit still, that is barely a limitation. When you are twisting to reach your own crown, it is a genuine nuisance. So the convenience question really comes down to who is doing the cutting, and on whom.
Battery life: the cordless question that matters
If you go cordless, battery life is the spec to scrutinise. A clipper that dies halfway through a haircut is worse than useless, so look for generous run times and fast charging. The BaByliss Super-X Metal offers up to around 150 minutes, easily several haircuts, while the Philips Series 9000 manages around 120 minutes with fast USB-C charging. Even a pro cordless set like the Panasonic ER-GP82, at around 50 minutes, charges fully in about an hour, so it is rarely out of action. Some clippers, like the Remington Pro Power, hedge their bets by working both cordless and plugged in.
Which should you choose
Use this simple test. If you mostly cut someone else's hair, especially thick or coarse hair, and want guaranteed, never-fading power, choose a corded clipper like the Wahl Elite Pro. If you cut your own hair, or you value the freedom to move without a lead, choose a cordless clipper with genuinely good battery life, such as the Philips Series 9000 or the BaByliss Super-X Metal. There is no universally "better" type, only the right type for how you cut. Once you have decided, our buying guide covers the rest, and our how we test page explains how we judge each clipper's power and stamina.