The hydraulic gear pump is often cheaper than piston or vane pumps. They are also more compact and lightweight, making them ideal for applications that require installation in a limited space. However, gear pumps have a lower volumetric efficiency than piston or vane pumps, meaning they have lower energy efficiency. They also have a shorter lifespan and can be noisier than other types of pumps.

On the other hand, hydraulic piston pumps have high energy efficiency and a constant volumetric flow rate regardless of the pressure level. They can also provide higher pressure than gear or vane pumps. However, piston pumps are generally more expensive, larger, and heavier than gear or vane pumps.

Vane pumps have an intermediate volumetric efficiency between gear and piston pumps but have a longer lifespan than gear pumps and can operate more quietly than piston pumps. However, vane pumps have lower pressure limitations than piston pumps and are therefore not suitable for applications that require high pressure levels.