Would you prefer a third DPS or healer in your dungeon?

I’m an arcanist/temp/nightblade exp player and with high dps and I usually join vet dungeons as a third dps (mostly with my partner). We smash through vet dungeons but I thought maybe I should get a healer for newer dlc dungeons. What would be your preference if we joined? For me to be a third dps or healer?