So, who's the best supp for a 2 or 3 GR? im playing with a friend, and sometimes my gf, and i like to do a nice sup for them..
WD support is good if they are lacking in damage/they have a good ammount of toughness already to servive on their own.
WW/Sol barb is an al around good build if you are running with heavy aoe that will benefit from tight grouping and provide CC immunity.
Globe Barb: if your running with a DPS that's dependant on globe pick up for power increase or has very very very low recovery but high damage (glass canons)
WW/Sol barb is an al around good build that's easy to play with and it makes it easier on the other players since you can keep everything in one place easier than other support classes allowing your party member to just stand there and damage away without a whole lot of worry of getting smacked in the face to death.
I would say that after a while i switched to Hota Globe from WW/Sol barb because my Twister Wizard pal suffered a lot during a single target boss and Hota with Solanium is the best in that case.
The biggest cons i think there are for this build are less survability even with high level Esoteric and Mutilation, Fury management (if by chance you hit more than 3 monsters, you dump a lot of fury and lose Aquila's buff) and monsters are more spread out.
Just open the 2p and 3p leaderboards and take a loot there. It aint hard, is it ?
Looking at leaderboard placements won't give you a description of the benefits of each build and how the OP could use them for the scenarios mentioned. He also might not be playing full time or at your level of understanding. We don't mind helping out with an answer to a quick question.