hydraulic dont need adjustment, but cost of components more than cable type.ie, slave and master cylinder.
pedal with hydraulic easier to depress.
basically cable clutches were introduced as a money saver for manufacturers, however, both seem to be just as common these days, probably down to smooother operation with hydraulic.
And this vehicle is how old?
Never hear of a hydraulic clutch.
Hydraulic clutches are often used on British and Japanese cars because they are easily adapted for left or right hand drive. Disadvantages are cost and the possibility of fluid leaks, but the technology is the same as hydraulic brakes.