The advantages of the Mecanum wheel and the omnidirectional wheel are flexibility and convenience, and the disadvantage is expensive.
The omnidirectional wheel, as the name suggests, can move in any direction, at any angle, and in any direction.
Therefore, compared to the traditional differential drive method, the omnidirectional wheel can complete the rotation while translating, without first rotating and then translating.
Omni wheel Note:
What makes the Omni wheel unique is its special tires. An omnidirectional wheel is not just a hub, but a combination of many tires. Its main body is a large center wheel, and the periphery of the center wheel is a small wheel whose center axis direction is perpendicular to the center wheel.
Like ordinary wheels, the large central wheel can rotate around its central axis, while the small surrounding rollers can make the omnidirectional wheel rotate in the direction parallel to the central axis.