Is there any reason to play BLM over RDM now days?

[Nezia]

There is also the fact many BLM running around right now are just RDM off-specs, so their gear is not optimized and BLM is probably the class with the best scalling in the game. As an example, on a dummy I deal around 10% more damage as BLM than as RDM, and that is with a 10 lower ilvl weapon and no spell speed materia, with full spell speed materias I could probably open a 20%+ gap.

Which is kinda sad, BLM gear is crap for the other 2 casters and vice versa, and I really can not afford to keep 2 sets of gear with full materia.