Best Class Duo in Diablo 3

A lot of people out there are looking to play Diablo 3 with a friend. If you are wondering what the best class duo is in Diablo 3, look no further, as you are about to discover exactly what that is right here.
Best Class Duos: Barbarian and Monk
While you might not think two melee characters make a great duo, that would only be because you have not yet checked out the abilities for these two classes.
First off, the Barbarian and Monk have the best class buffs in the game. War Cry from the Barbarian provides a sizable armor buff, whereas the Monk has a variety of powerful Mantras that can be used to boost resistances, dodge, damage, or quite a bit of healing.
In addition to the defensive boosts, the Barbarian can use Threatening Shout to reduce the damage enemies deal by 20% and Concussion (Crippling Wave rune) does the exact same thing. This reduces the amount of damage enemies deal by a significant amount.
Finally, the Monk gets access to an AoE heal which can be used to boost both the Barbarian and Monk’s damage. The AoE heal is very powerful but has a short range, which makes it hard to use on ranged group members. Fortunately it is very easy to use on the Barbarian thanks to the short range.
Other Diablo 3 Class Duos
What about the other classes? Well, the Witch Doctor, Wizard, and Demon Hunter are all good classes, but they do not have nearly the same level of buffs as the other classes. The Witch Doctor can slightly boost group damage with Hex, the Wizard can slightly boost group damage with Conflagration, and the Demon Hunter can slightly boost damage with Marked for Death.
These buffs are all weak and on the order of about 10% or so increase in damage. None of these are significant buffs like Warcry or Mantras. This does not even include the damage reduction effects of Threatening Shout or Concussion. I am also not including the variety of runes that offer small debuffs to the enemy that the Monk has or the large quantity of stuns you can use as a Barbarian.
All in all, the Barbarian and Monk are great partners and in my opinion the best duo in Diablo 3.