Well, at the moment SMN is the worst DPS job for endgame raiding... Because they run out of MP too quickly.

That doesn't really matter at the moment though, because Heavensward is coming soon anyways, and all jobs will be getting some more abilities and traits, and maybe other changes... I'm sure SE are going to fix SMN's issues at that point.

Heavensward could actually change your opinion on what job you want to play too. Who knows what will change.

Because of this, just pick the job you like the most, cause it doesn't really matter at the moment.