I was under the assumption that (player skill being equal) that the dps was:

Best
1) MNK
2) DRG
3) BLM
4) NIN
5) SMN
6) BRD

Now that being said, most of the DD jobs are so close they are more or less tied for positions. Like SMN/BRD, NIN/BLM/DRG/MNK. Again this is if all the players playing the jobs were at equal skill and they were fighting a training dummy not a boss which requires you to move, which is why this ranking would obviously shift and in some cases move BRD up a couple ranks because of its mobility aspect.

Just my 2 cents.