Probaly the tank companions if you talk level 50. even while leveling tank companions arenīt used much.
Very true. Less effective overall, and some are awful (I understand tank comps were considered overpowered in beta and nerfed). Healer companions are overused IMO. Ppl think they'll get thru their dailies faster with a healing comp but that's not always the case. Most of the ranged dps comps can really rip it up. Properly geared, they're actually occasionally useful in open world PvP too, if you can keep them up for most of the fight.