WoW doesn't have to recreate a game from the ground up.
WoW didn't have to deal with an earthquake.
WoW's graphical detail isn't as complex or taxing as XIV's.
WoW is specifically for the PC while XIV has to keep the PS3 in mind.
WoW has had 5-6 months from cata release and where probably planning the content release for a long time, Yoshi has had 3-4 months to completley re-structure the game.
WoW has a lot more room for freedom of development due to it's high popularity.
WoW bleh blee bloo blah blah.
