Paladin - Defensive class that relies on breaking/stripping gear from their opponents, then Sacrificing them. Another tactic common in Paladins is to reflect damage back at 100% and up.
LK - Offensive class that relies on Bowling Bash to kill their opponents. They hae recently been at a disadvantage because of the exploit of Valkyrie Randgris dispelling their element. This then makes LKs burn through much of their converters.
Basically, it's if you want to go offense(LK), or defense(Paladin).