Lol at anyone trying to say that WAR isn't mandatory for raids.

The tank hierarchy is as such:

1. WAR
2. WAR
3. WAR
4. WAR
5. DrK
786. PLD

WAR is the most complete tank in the game and has ZERO downsides. DrK is good but has flaws. If you are endgame raiding and looking for a static them go with WAR. If you are just casually playing then go with whatever feels the best.