So BLM as AOE covered, MNK has single target... What does SMN bring?

[Judge_Xero]

Also remember that SMN are severely disadvantaged when there are multiple things to kill that die very fast (ie: bennus in T12, adds in T13,e tc). This is because the dots die with them and are wasted dps, but the SMN still needs to set up the dots to fester.

It's not that bad with DoTs.

In the case of "should I Fester or Bane?"

On a single mob if your DoTs last for 9 Seconds then it's a + over Fester and you save MP. Then it just scales up from there.
Example
- Baning off Phoenix onto the Bennus
- Baning off Big Bennus to little Bennus

T13 - Selective Dotting on mobs that will die fast but you are unable to Bane and/or Fester would be a waste.
If you know how long Bthe mob will last you can plan from there.

If the mob only lasts 12 Seconds
- Bio + Ruin Spam 400 Potency over 12 seconds
- Bio + Miasma + Ruin 420 Potency over 12 Seconds + extra MP
- Bio + Miasma + Bio 2 + Ruin over 12 Seconds 405 Potency + crazy MP usage. (Fester will increase this to 705 Potency)

12 Seconds or less Bio + Ruin spam is the most efficient as long as you have another mob that your Dots are ticking on. I.E. Dots on Bahamut Prime.

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SE does need to boost the damage increase from Main Hand weapon for Summoner though. To bring it closer to BLM/Melee