I'm an old fashioned guy that started keeping fish when air powered under gravel filters where the norm. As you had to have a pump it seemed daft not to get one with an extra nozzle and use it for an air stone / curtain.
Although I now no longer use the pump to power the filters, a fish tank without an air stone just doesn't look right to me so I still have a dual pump with a disc type stone at one end of the tank and a curtain at the other (behind the plants so the bubbles look like the are rising from the plants).
But, as others have said it now personal preference...