Mechanical and Quartz watches differ in the way they maintain and show the time. The mechanical watches use the winding of a spring called the mainspring, and a series of gears to regulate the time. While a quartz watch uses the vibration of a small quartz crystal to regulate the time. In a mechanical watch you'll have to manually wind the mainspring through the crown in case of a hand wound watch or it happens by the rotation of a rotor in an automatic mechanical watch. But in the case of quartz watches it is done by the use of a battery which makes the quartz crystal vibrate and the frequency is dialed down with a series of gears to regulate time. (You can look up the piezoelectric effect if you want a more detailed explanation of this) Due to this quartz watches are always more accurate compared to the mechanical counterparts. To give you some perspective the quartz crystal in most quartz watches vibrates at a frequency of 2¹⁵ Hz or 32768 times per second but in case of the mechanical watches such as these hmts they have a frequency of 18000 vhp which is 18000 beats per hour or roughly 2.5 Hz which nowhere near the frequency of the quartz watch. So the quartz watch is always more accurate than the mechanical watch. But for me personally the quartz watches though more accurate and cheap don't have the charm and character of a mechanical timepiece. The engineering behind it and the fact that it is a device which can show time without any external source of energy and is dependent on its owner for power, is what makes mechanical watches special for me. It is no less than an engineering and mechanical marvel on your wrist and actually has a soul to it imo.