Another popular leveling guide is called “Booster”, which is also available for all races of Horde and Alliance. Similar to Zygor, Booster is an addon that you view inside the game, and it tells you exactly where to go and which quests to do every step of the way to level 120. The leveling path was created by professional gamers, and optimized to make your leveling as fast as possible. Booster also comes with free lifetime upgrades and updates, so you literally just have to pay once and use them forever, which is awesome. It’s created by a company called Dynasty Addons, that has been around for almost 10 years, and their guides and addons have always been updated in a timely manner for every expansion pack. It’s easy to see why this leveling guide is so popular.
From my understanding, the world boss is always there when your faction controls the Warfront. Like other world bosses you can only get gear from him once a week. There are other world bosses in the zones outside the warfront and 1 spawns a week just like Legion. I’m not 100% sure that the warfront will be available on launch but I have yet to read anything that says otherwise. The quest also reset once a week as well. Think of Warfronts like old Tol-Barad
These two expansions are virtually identical in terms of exp/h. I personally favor Mount Hyjal, and think it's very slightly faster. But if you know Jade Forest well you can just as easily keep up there. Ultimately you'll end up doing both anyway, so it's mostly academic. Every time I've tested Valley of Four Winds or Deepholme, or any other zone in MOP/CATA's level range, they were worse exp/h. You should not even need to complete both zones to ding 91, so it's more important to just pick one and go.
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Also note that power leveling is sometimes used to refer to paying someone else to level your character to cap as fast as possible (i.e. they power level for you); a distinction used by Blizzard is to refer to the paid leveling as "power leveling service." This behavior is against Blizzard's Terms of Service. Power leveling yourself, which this article covers, is perfectly acceptable.
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Edit 20 It’s been a week since this post and a lot of people are still reaching out to me with questions which is fine. I have had a few different people reach out to me to help make YouTube videos based off this guide and more info in BFA which I’m more than willing to do. Whoever gets the videos up first I will link them here for you guys to enjoy.
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