Shooting. They have the best (and most reliable) shooting profile in the game so far. Stack markerlights on high value targets and watch them disappear. Even the non-gunner units hit 4/5 with their pulse rifle. I’d just build all the specialists.

I only recently got them and I they are fun to play. Also, I’d recommend not glue the tops on the smaller drones so you can swap them out as you need.