Questing is faster than grinding, but only if you have your quests somewhat organized. This is why I like wow powerleveling guides. Many players don't really need them, especially after leveling several characters all the way. Always stop in an inn when done and always make sure you have rest XP available when playing your toon. When you run out of the rest XP then you hand in whatever quests and log out in an inn to recharge.

 

If you stick to the rest XP and you have your quests organized you should find yourself leveling very quickly. If you run out of Rest wow powerleveling XP and just have to keep playing then go for it, or farm for items or gold or rep or go kill other players. Heck, log into your auction house banker and do some buying and selling. If you always pair with someone to do your leveling youll find that the levels go by significantly wow powerleveling faster? You will be able to take on tougher mobs, those silver elites will be much easier, the gold elites will become something to sneeze at, team quests will be a lot easier, and your chances of getting ganked on the PvP server are a little less. Conversely, your chances of successfully ganking others is that much better.

 

You will get less XP per kill, sure, but you will kill things a lot faster. You will also have less downtime, even if the extent of your healing capability is your first aid skill for wow powerleveling. Have lots of playing time? Roll several toons and combine playing them with the rest xp. So you will have two more characters leveling at pretty much the same rate, you will l be able to stay in the rest xp zone for 100% of your playing time, and you will have those characters all hitting 70 arouind the same time.