What's the main difference between 2-axis gimbal and 3-axis gimbal?

multirotor

#1

Normally there is no zoom and gimbal for FPV camera. For some professional applications, the UAV requires Zoom gimbal camera, the question is what’s the main difference between the 2-axis and 3-axis?

2-axis gimbal camera:

3-axis gimbal camera:

If the price is the same, which one you prefer to?


#2

Yangda Security_Sky Eye-U30_datasheet_waterproof.pdf (571.3 KB)
data sheet of the 2-axis gimbal camera 30x zoom.