I leveled a PLD and switched to using PLD for Turn 4 because it didn't seem worth the extra hassle to be WAR for Turn 4.
I also found being PLD was much easier in Turns 1 and 2 than being WAR. Now that I have both tank classes at 50, I can choose to be lazy and be PLD and make it much easier for myself and my party. You don't get any medals for doing it the hard way in MMOs.