However, at least to me, dungeons SEEM faster than questing
Dungeons are slower than questing for sure. The only reason it seems fast is because of the dungeon quests; any time you run the place afterward you definitely notice how bad they are for leveling. --- I will rule the world, and find that truly good cup of coffee.
^^^ This. There are some situations where dungeons are faster, such as when you are RAF and never have to visit the same dungeon twice, but overall quests make it break even with questing, and after that it is much slower.
And to clarify my last post, usually when I do dungeons it does seem faster than questing, most people I have talked to also feel the same. However when I have actually sat down and measured it, questing is faster. If you prefer dungeons go right ahead, but if you want speed, quest. --- World of Warcraft, Dark Souls, Magic: The Gathering. I know a lot about each of them so if you have any questions, just ask.