I play both Summoner and Black Mage, both has their pros and cons, but both are equally as useful and fun to play. Depending on the instance, I choose either BLM or SMN, if it's with a group I know and trust I go BLM if it's a PUG I go SMN. I like the pure power of BLM because if you are good at your rotations, timing, positioning you will push out some impressive DPS. I like the versatility of SMN, being able to do burst damage while managing your pet, and being able to do an emergency rez can make a difference sometimes in recovering from a potential wipe.

The cons of playing BLM is the potential to get interrupted during a rotation and having to readjust the rotation according to the incoming attack. You also want to make sure that you don't eat attacks for the sake of DPS, a bad DPS is a dead DPS, keep that in mind. The cons with playing SMN is the fact that they do burst damage and that keeping your DOTs up at all times, also selecting the right Egi for the job.