It is indisputable that the recently added Argent Tournament faction has the best WoW dailies currently found in the game. This is not a tough conclusion to come to for three reasons:
1. The Argent tournament dailies offer the most gold per hour out of all of the current daily quests. Due to the travel demanded in completing all of the other dailies, Argent Tournament is the best gold per hour in the game, with the possible exception of a couple of the Northrend fishing dailies.
2. Players are able to buy high item level weapons and armor with the tokens and faction rewarded from finishing the Argent Tournament dailies. Other daily quests only provide you with reputation for the old Northrend factions, which do not provide items of the same level.
3. They are the quickest WoW dailies to complete. This is simply inarguable due to the fact that almost all of them are located within the same area. Flying from one objective to another is more often than not a measure of seconds, instead of minutes.
Not only are these the fastest dailies to do, but they can be made even faster through using a WoW dailies addon which gives all of the locations for the quest objectives. If you only do your dailies for one group, make sure its the Argent Tournament.