You were using the 3rd job names, so... assumed it wasn't 4th job.
Sure, if you're just attacking an infinite HP monster with low def then the Dragoon might win. If it had high def, the Overlord will win. However, PvE isn't dps, it's more burst damage. Even in Hero mode Van Cliff with the ~140 monsters, you still have short breaks between each group of mob. Overlords can just wrestler and move on to the next group => wyvern and stormblade if needed => gust slash then bro or deathbound and stormblade => deathstinger, or wyvern and combo again since your CD would most likely be over by now. The monsters there also have rather high defense too.
I've already compared endgame; +8 Superior Lightning Oak on both Dragoon and Destroyer(Overlord). I(Destroyer) definitely cleared mobs in PvE faster.
IF you want to compare at Arkah F6, the Myrm/Destroyer clears faster too, with 1 wyvern killing the whole spawn. Same with wrestler, or deathbound => stormblade. Also broom jab has pitiful width, so all you can really rely on for messy mobs is crosscut => bear => stormblade.
Edited by DirtyClaw, 19 October 2010 - 10:06 PM.