The downside with the Mawloc is that if it mishaps and goes into ongoing reserves can it deep strike again when re-entering the next turn? People are playing that it can, but it is not explicitly stated. Also, once the mawloc comes up he is dead. He can't fight, has no shooting, and if you are able to go tunnel again, it is an every other round S6 AP2 large blast. I have my bets on the exocrine for damage output.