Generally, both are used for power transmission. These are often used in vehicles and Mechanical Applications.

The chain drive contains sprocket on both sides linked by chain to transmit the power whereas belt drive includes pulleys or shafts on both sides, linked by synthetic belt to transmit the power.

Chain drives are made of metal which makes them more durable and stronger compared to a belt.

The belt drive is smoother and lasts much longer. The chain is better for very high torque and big swing arm movement applications, but replacement through chain stretch and sprocket wears a regular unwelcome expense.