From a Healers perspective ... I'm guessing Guardian is the easiest to Heal in both raids and groups, but what about the other Plate Fighters? How would you rank them in terms of easiest to keep alive?
Any tank is easy to heal if they are not wearing a paper bag for armor and aren't in offensive with no shield ...IMO anyway. I've always had a tough/unfun time as a Templar healing an avoidance tank (monk or bruiser) because if they are well-geared and playing their class right, they avoid and reactives are not that helpful. You CAN heal with that combo, you just have to pay more attention as the healer. Crusader tanks (Paladin/SK) are also really easy to heal ...because they heal themselves, too.
