Herald also heals allies, which is a plus (especially in PvP). It especially synergizes with the mini Crusades etc from WoA.
You may have to try big Wings on Templar.
Herald feels to be the superior in pvp and honestly i enjoy it, feels like can survive finally even a little without trustfalling to bubble everytime. Templar should probably provide more burst than it does currently to be viable option as glass cannon big numbers option.