The A.T. Guide The Thru-Hikers Handbook  
Organization BETTER   The A.T. Guide places relevant material on nearby pages; the THH's front/back format makes for a lot of page number look-ups. 
Profile Maps WAY BETTER   The A.T. Guide's profile maps are roughly twice the size and much more detailed.  All landmarks are aligned with the profile.
Town Maps WAY BETTER   The A.T. Guide's town maps are larger, proportionally scaled, and there are many more of them (50 instead of 28).
Triple Shelter Mileages UNMATCHED     The A.T. Guide shows cumulative distance to 3 shelters in each direction.  
GPS Coordinates UNMATCHED   Enter GPS coordinates into your vehicle's GPS (or Google Earth) for help navigating to trailheads.
Southbound Edition UNMATCHED   Using this edition, southbound hikers can read north to south data normally, oriented front to back, top to bottom. 
Unbound Edition UNMATCHED   Planing to cut out the sections you need?  Save yourself the work & get a cleaner cut by purchasing pages that haven't been bound.
Email Updates UNMATCHED   Sign up to receive updates.
Cost CHEAPER   Cost with shipping from each book's website:  A.T. Guide:  $19.90, THH $22.50.  Get a better book and pay $2.60 less!  
Name recognition     THH  has been around many years and has changed little. Though some old-timers may truthfully advise that “it worked for them,” there is now an option that will work better for you.