The way I personally look at it, the DPS and healer affect how i pull. Let's say you get 2 NIN... Not the most powerful AOE, but tons of single target. That is a case where small, rapid chain pulling works out not only for the tank, but also lets the ninjas do what they do best, rip single targets apart. People are always going to be arguing what is quicker, I just tend to go with what seems more viable for the party make-up all around.