Two Surtrs.

He has no super bane on Res so it would still be on 30 which is good for a mixed tank.
If you're worried about mages killing him, give him DD and he has 36 Res.
It's WAY better than having useless 20 Spd + a Super Bane on HP what drops it to 46 and losing BST for Arena too.
Just looking at the stats of a unit, looking at the IV and thinking about what could be more usefull to me and not asking right away other people before considering the following is the most logical way of taking the IV (not meant to be mean).

Next time do something I do often:
Write both IV's down on paper (or something else), look at the stats +'s and -'s and think of which one would suck the least.
This time it's pretty obvious what the worse IV is (atleast in my opinion).