Play whatever sounds cool to you and roll with it. Certain classes will be min max wise slightly better but all classes are plenty viable for their respective roles (sans high end tanking maybe when warrior discs are too good).
That being said between monk or sk I like the sk. Monks are a dime a dozen but good knights are quite rare and the best group tanks IMO . Also with no raid size limit guilds will always have room for competent players.
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