I would say easily that physical is the best build currently imo. I main WD and play all builds etc make videos and stream, and of all things I have tried pet wise, physical seems to be the best. Now I will say that it is the best for single target and blowing up bosses, so if you have good aoe it rocks to have a solid pet WD. My current build can boost party damage by 65% and I could even push it to 95%. I sometimes like to even use locust swarm pestilence with bad medicine passive to reduce all enemy damage by 20%!! So pet WD in all reality can provide a lot of good buffs for the team, and considering a lot of the elite % damage reduction etc does not work on certain elite ability's, it can quickly become a very valuable skill set up. More or less boosting party damage by 65% as well as dropping enemy damage by 20% is a huge boost for you and your team.
I have Mask of Jeram and Tasker and Theos.
Whats the best elemental to go? Phys or Poison?
What build?
What skill damage should I aim for on what parts and so on?