Based on the base damage/DPA - and the results posted on the pylon thread, Titan Weapons is probably the best damage available to Tankers. Probably most damage would be with Bio then possibly one of the other damage type primaries (possible rough order -fire, rad, electric, dark TW doesn't work with shield)
But like they said above- its probably easier to build a brute's survivability up to SO Tanker levels. Then any Melee set would likely work