Oh, to answer the other part of your question:
"Best" is relative. It depends on the content you are doing. WAR is indisputably the king of dungeons, for example. Its absurd self-healing allows it to essentially not even care if it has a group with it. DRK is considered the king in EX, Savage, and up because of its strong mitigation tools and high damage output. GNB is also greatly favored for high-end content. PLD... well, PLD exists. Someday it will be good at something. Maybe. ...We hope.