I do recall that the Dual-Action agitator had some trouble with air bubbles, surprisingly, but was able to get them out eventually. The DD Surgilator is the same; not the best but not the worst either. The Power-Fin's ability to remove air bubbles depends on the size of the load, but usually gets all of the air out 99% of the time--If not I just set it for another rinse. The Roto-Swirl does probably the best job of the oscillating agitators; it is the only machine that can roll the sheets with the air bubbles still in them, if they haven't dissolved already.
In my opinion, however, the 1-18 is king. Air bubbles are no match for the surging pulsator action and dissolve right at the start of wash and rinse. The load I photographed and posted was a set of my sheets; these are "heavy" compared to the others and bubble easily. But, as you can see, no air bubbles were present in either the wash or the rinse.
--Austin