You've said electromagnetic, but the most common I think would be electromechanical for these models.....?

From a maintenance/cost point of view the mechanical brake wins.

But in terms of function and benefits the electromechanical or electromagnetic they would come top.

Any electrically controlled system can be made to do what the controller wants it to do and this makes it flexible, where as a manually controlled system relies on an input from an external force. Features of such systems are holding a machine on a ramp without operator input, preventing rollback on a ramp by locking the brakes and allowing power to be applied before releasing the brakes, applying the brake when machine is switched off or left unattended.

I am not a particular fan of electromagnetic brakes because of how harsh they can be in applying and releasing.