Tassos ticks do generate enmity. All dmg generates enmity. Ask a SMN that throws all his dots at a boss if he generates enmity or not.
(PLD's Circle of scorn is severely underused because of the common misconception. In reality enmity is based on ALL damage/healing delivered).

@Javid if speed running is your answer then yes certainly increased DPS is more beneficial but in a party your MAIN job regardless of speed run or not is keeping hate on you. That's it. Bottom line.

Dealing as much damage as possible is secondary to keeping the mob(s) attention on you rather than the healer or dd.