World of Warcraft: What is faster leveling, Dungeons or quests (with leveling guide)?

You really don't need a leveling guide dude... Theirs a board in every major city that tells you where to level. Just get a quest helper mod and you should be fine. And you have heirlooms so use those. Just level questing because it's a waste of time to find a group for a dungeon in Outland or Northrend. Stay in Outland until level 68 and then go to Northrend until 78 I'm guessing.