If all was equal, I would prefer dc equipment be the standard just from a safety standpoint. Ac used to be cheap as dirt and bulletproof. Ac pumps can be a bit louder but it’s more of a white noise hum to me. Dc pretty silent but that whir sometimes bothers me but that’s just my brain/auditory dis function. I think having variable speed is good for some, but at the same time a hurdle for others. Sometimes, some people would just be better off with on or off being the only option. I do despise the power brick though! Here a brick, there a brick, everywhere a brick! A bunch of hot potatoes laying around. I always thought a universal dc power supply/strip with 12 and 24 volt standardized plugs would be cool beans.