Basically what OrionInerghem and Sinaloa were saying. It all comes down to Group Comp/Players. When I tank I will look at my group and decide if I'm going to do big AoE pulls or mark a target for them to burn down and do chain pulls. If I see 2 Black Mage/Bard/Summoner then I am for sure doing AoE pulls, but if a Dragoon/Monk is in the mix then I might do chain pulls.

AoE DPS is always going to be inflated and higher then that of Single Target.... But if you have 2 high AoE DPS Jobs, then yes it will be faster. However if you have a mix group then it really just comes down to how geared you guys are for what is faster. If you have a super geared Monk then probably Chain Pulling is faster then AoE.

I've had no troubles as a White Mage being able to keep a tank alive on a 3+ pull while healing them and DPSing the mobs, however for the few runs I have done where we CC mobs and I'm basically in Cleric Stance all the time, my overall time has been slower by 7+ minutes.