What Judgement should I use?
That depends on your group. If you’re the only paladin and there are mana-using DPS in the group (hunters, mages, warlocks, enhancement shaman, shadow priests, etc), use Judgement of Wisdom. If there are holy/prot paladins in your group, have one of them cover JoWisdom and use JoLight. If you are in a paladin-heavy group with multiple rets, the ret paladin with the highest buffed AP value should use JoLight, and the rest should judge something else.