Knight's weapon attack is strongest,with Excalibur,Ragnarok or something like that,but when I didn't put nothing on weapon's place,and he attacked with hand,his attack does 789 HP!
Knight is very useful,but best job would be Holy Swordsman.
IF you asks best regular job,that would be Time mage,cause he
has all kinds of magics:time changing (stop,haste...),attack (meteor),special damage (demi),and moving (teleport,float).