Do you guys value skill or build more?

If you had a choice between being good/better at the game mechanically (positioning, blocking, knowing animations, special sniping etc) or making good builds (good synergies/properties/talents etc), which would you pick? Personally I don't bother going for good or "meta" builds or caring about breakpoints and stuff like that and just pick whatever weapons and talents feel good enough and spend at most 5 minutes completely setting up a career, but still carry my weight on cata.

On a related note, does anyone aim for headshots? For some reason I usually have the most headshots despite not massively going for them.