That's really tough to quantify without having actual independent measurements to look at. They'll all have their own response curves, power compression, group delay, maximum output, distortion, etc.
Going by gut feel based on brand reputation and measurements of other subs I've seen, I'd say that the eD will have the most output while still having relatively flat response and a decently tight sound. The HSU will probably have a similar character, but, due to its smaller driver, not quite as much volume. The Bic will approach the eD in terms of volume but will sound looser and less accurate.