If you have to walk back into coach I find that even a 14" wide normal roller will sometimes be difficult to maneuver and slam into the knees or seats of my fellow pax. Based on that experience I'd never choose a widebody bag.
I do have a rolling triple fold 20" wide garment bag by Andiamo Valoroso. Splendid bag. Looks super chic, packs very well. Royal PITA because it doesn't roll easily in narrow spaces. Sure, 20" wide is extreme but it just goes to show that widebody is not an answer to a problem but a problem looking for an answer.
Till