Agreed with Ryan. The thing that makes a rotary a rotary is that it will continue to spin regardless of how much pressure you apply. So you can go at the paint hard and fast but if you're not well practiced you will burn the **** out of your paint. A DA cannot mechanically apply that extra pressure because the heads will stop. This is what makes them safe and also makes them slower.
Unless you mean you can get better results faster because the DA compensates for any mishaps from the rotary that you need to double back on, your argument is invalid
