I'm a newbie Guardian. I already have a ascended zerker set and all ascended weapons. Which elite spec should I choose to fractals and raids?
PS: I can run viper too
DH is the best DPS for fractals, and iirc., it is very solid for raids too.
Both are good options. DH is a pure DPS where Fb mixes in some group utility in the form of Quickness. Damage types are different so for raiding you want to consider what damage type is preferred for which encounter. AFAIK there's a growing need for Quickbrands though.
You only need like 3 ascended trinkets with Diviners stats on them as Quickbrand, so I'd say for Fractals you can run both depending on the group composition.