When I want to prog...I hop on RDM. It's so versatile and you don't really lose your spot in your rotation. Even for a mage.

BLM is very restrictive and kinda makes me sad when I have to move. Especially....ESPECIALLY when I lose enochain. Nothing is more world crushing then losing enochain with 25 seconds left until you can reapply it. I tend to stay away from BLM.

SMN - Holy balls get on the roller coaster? The current iteration of SMN is literally "Keep Up! and don't screw up your cooldowns!" I like it, but can't wait for the new SMN in EW.

RDM is just flexible. I don't lose my spot from movement, it has dualcast which is basically swift cast every other cast. Pretty much watch the gauge and see what mana you need. Hit 40 white/black, manafication, Embolden, unload your mana.