I have BLM 50 amd MNK 31 so I love to DPS and I really think its situational as to which class is better. If I am going solo Definitely MNK but if I am doing a run with my FC with a tank I trust then I will take my BLM. Mnk for me is a lot faster when it comes to chaining attacks but With BLM transpose they have more staying power and are not as tied to TP watching as much as a mnk is in a long fight