Mechanical watches have longer lifespans than that of quartz watches. A mechanical watch can last indefinitely with proper care and servicing. Should it break down , parts are always available for repair. A mechanical watch can become a collectible and it can fetch high resale value due to its rarity. A quartz watch on the other hand features electronic circuitry that has a limited lifespan. You cannot repair it because the electronic components for it would be obsolete by then.

Quartz watches are much less affected by extremes of temperature than mechanical watches. A mechanical watch is quite normal in extreme cold temperature. But quartz watches are sensitive to extreme cold temperature. In other words, a mechanical watch can keep it working even during the extreme cold temperatures while the battery of the quartz watch will shut temporarily in cold weather. It is obvious differences beween them.

As mentioned, a majority of the watch industry has gone quartz replacing the fad of mechanical watches that dominated the world since the 14th century. A mechanical watch is a device for keeping time, which uses the energy from a wound spring, and keeps time through the highly regulated release of that energy through a set of gears (the balance wheel) and an escapement. Since the invention of the quartz watch in the 1970's, nearly all of the watches on the market are quartz battery powered. You can see 90% of all watches manufactured are quartz watches today. Quartz watches are cheaper to produce. Quartz watches are more accurate, reliable and require less maintenance. Unlike mechanical watches which require maintenance every 2-4 years. It is a fact that quartz watches are 60 times more accurate than mechanical watches as a decent-quality quartz watch generally gain or lose no more than a minute or two a year while a mechanical watch may lose one minute a week. This brings in bigger inaccuracies for longer periods of time. In a year you would lose a minute for a quartz watch while a mechanical watch loses up to 1 hour in a month. What makes quartz so accurate is its extremely high
oscillations of up to 32,768 cycles per second.

Quartz watches have few moving parts. Moving parts cause friction and wear and tear and as a result they are more prone to breakdown. By having less moving parts quartz watches do not have breakdown as often as mechanical watches. Also , the gear train of a mechanical watch is under constant load from the mainspring whereas the gear train in a quartz watch is not under any load.

Mechanical watches also require servicing every three years to keep the watch working in good condition and tell the time accurately.

Mechanical watches require winding up which provide reserve power of 40 hours. An automatic watch relies on the movement of the wrist to power itself. But still, if you do not wear it all the time and just wear occasionally, you will find the time on the watch has stopped and you need to adjust the time . A quartz watch powered by a battery is constantly powered and tells accurate time all the time and do not need time adjustment. Of course you do need the change the battery after two to three years.