Functionality is the heart of these guides, what you are really paying for.  There are a lot of aspects I could look at with regards to functionality such as; questing path; quest progression; addon user interface; bugs; performance and many more.  All that we are concerned with are questing path (speed) & user interface.  All the other aspects aren’t worth comparing as both wow guides are light in terms of system usage, both have very few bugs, and both update your quest progress in real time.
You’ll get a small window inside the game with instructions for what you need to do next, every step of the way to 120. You’ll also get a waypoint arrow that points you in the right direction to go at all times. If this sounds extremely convenient, you’re right! Zygor’s leveling guide/addon has completely taken the frustration out of leveling for me, personally. No more reading comments on WoWHead about how to complete quests. No more getting stuck, frustrated and bored with leveling. And no more feeling like WoW takes too much effort.
Before there was ingame WoW leveling guides, there was just eBook PDF leveling guides & what you paid for was the questing path.  As far asWoW leveling guides have come with fancy ingame user interfaces, the questing path is still the core.  Both WoW guides spend endless hours researching their questing path to find the fastest way to reach lvl cap.  It is pretty hard to deem one faster than the other as both produce extremely fast lvling times.  The reason I wanted to touch on this area is to confirm that both are really well planned and have seemingly very little difference.
1 All expansion guides are written in the Battle for Azeroth beta in order to have them ready on launch day. It's important to note that betas can be buggy and unstable and may delay and even halt our progress on the guides. Furthermore, the time between the start of beta and the announced release of Battle for Azeroth is much shorter (by about 2-3 months) than past betas. As a result, our primary focus is to have the Leveling guides updated by the launch, and only if those are complete and time remains will we work on updating the remaining guides. All guides not finished in beta will be updated post launch. You can read more about this here.

Arcane: Arcane Empowerment - Clearcasting can now stack 2 additional times, and increases the damage of Arcane Missiles by 5% per stack. Clearcasting no longer reduces the mana cost of Arcane Explosion. Fire: Flamecannon - After standing still in combat for 2 sec, your maximum health increases by 3%, damage done increases by 3%, and range of your Fire spells increase by 3 yards. This effect stacks up to 5 times and lasts for 5 sec. Frost: Concentrated Coolness - Frozen Orb's damage is increased by 10% and is now castable at a location with a 40 yard range but no longer moves. Monk
It is a wonder how this is even a debate; Zygor WoW Guides has clearly got the best product going.  Seeing as they have a lot invested in the WoW leveling guides community; they are here to stay.  You won’t have to worry about their guides going obsolete or out of date, as they are literally a company that has put a lot of hard work and dedication into their products.  Dugi’s WoW guide is not terrible and many many people love this product..  However, with free 3rd party addons as a part of their lvling guide system; I wonder how stable their product is in the long run. Nonetheless…
I also wanted to note that a lot of users, I found on the Web claimed Dugi’s Guide to be faster.  However, all these users had either used Zygor Guides for very little time or had not used it at all.  I have to give a point to each Dugi’s Guide and Zygor Guides as they both deliver a great lvling speed.  For all you Dugi’s guide users out there who really feel that Dugi’s Guide is faster, I will give Dugi an extra  point.  If there really were a difference, it wouldn’t be by much.
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