Every watch is driven by a movement, and almost all of them fall into two camps. The choice affects how your watch feels, what it costs, and how much attention it needs.

Quartz

A quartz watch runs on a battery. A tiny crystal vibrates at a fixed rate and the watch counts those vibrations. The second hand ticks once per second.

• Accurate to within seconds per month
• Battery lasts roughly one to three years
• Thinner and lighter, because there is less inside
• Cheaper to buy and cheaper to service
• Survives being left in a drawer for six months

Automatic

An automatic watch is powered by a mainspring wound by a weighted rotor that spins as your wrist moves. No battery at all. The second hand sweeps rather than ticks.

• Accurate to within roughly fifteen to thirty seconds per day
• Stops after one to two days off the wrist and needs resetting
• Thicker and heavier
• Costs more, and servicing costs more
• Many have a display caseback so you can watch it work

So which one?

Choose quartz if the watch needs to be correct when you glance at it, if you rotate between several watches, or if you simply do not want to think about it. It is the sensible default and there is no shame in it.

Choose automatic if the mechanism itself is part of why you want a watch. A sweeping second hand and a visible rotor are genuinely satisfying, and plenty of people accept the daily inaccuracy for it.

A useful rule: your first watch should probably be quartz. Your second is where automatics start to make sense.