I voted WOD, I want to add some thoughts though.
I really, really liked playing Cataclysm Survival. I think that was the best Surv iteration.
I really like playing Legion MM, but I do miss the option to summon a pet.
What I would like to see in 8.0 ->
BM made in to the melee spec (as it should have been from the start).
MM stay similar with added pet option. (and I miss the bleed damage from crits)
SV turned back in to a DoT spec, either with a shadow theme, or with a gadget theme. (and renamed to shadow hunter or rifleman or whatever)