Depends what you want to accomplish in the game. If you want to do decent DPS to other players and have the possibility of one-shotting people, go for a Warrior/Shadow Knight.
On the other hand, if like doing TMQ/UD/CC, as a healer, you'll never have a problem trying to find a party. With the correct gear and technique, a Dende could easily beat an Shadow Knight. The DPS done just from auto-attack for a Dende is amazing with attack speed.
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