Different types of gears

Planetary gearing is the most popular and affordable type of winch gear. The name comes from the design, which is similar to planets revolving around a sun. The winch uses a small planetary gear and a coaxial shaft capable of large reductions in a small space. This device is used for handling high bearing loads with smooth operation, and provides good resistance to torque loads. They are between worm and spur gear types for the amount of drivetrain friction and amp draw with a transfer efficiency of 65%.
Advantages：
1.Low cost
2.Low weight
3.Compact size
4.Good resistance to torque loads
5.Smooth operation
Disadvantages：
1.Brake required to hold load
2.Drum gets hot when spooling

Planetary Gear

Spur Gearing is a simple gear using two or more parallel shafts with gears operating in the same plane. Generally, there is one large gear on the motor shaft and a smaller gear on the winch shaft. Spur gears are the most efficient type of winch gear with a75% transfer efficiency. Spur gearing produces less friction and greater efficiency than planetary and worm gearing, but requires a braking system.
Advantages:
1.Most efficient
2.Fast
3.Do not need a strong break
4.Low internal gear friction
Disadvantages:
1.Not easily mounted to vehicles
2.Expensive
3.Not widely available on the market

Spur Gears