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Not necessarily. The adjustability of a dc, speed controllable pump allows another knob to tune the pump to your bioload.As far as skimmate performance, there isn't going to be a difference, only that the way you achieve the proper flow through the skimmer body is done differently.
If your DC skimmer is putting out frothy skimmate it's because it's tuned to do so. You can achieve the same goal with an AC pump.
The benefits are as gablami stated. It boils down to preference, longevity over efficiency. for most people it's a moot point and you stick to what you're familiar with.
With ac, one size fits all.