What is the best dpm for Shadowers?

Title pretty much says all. I've been deciding between PP + Savage blow (on shadow partner of course) + meso explosion vs. Full charge assassinate (on shadow partner). Both seem to deal a whole lot of damage, but which one is better?

So what is exactly is the best dpm for shadowers? (It will probably be different depending on the boss and if so which one will be better on certain bosses ie: Zak, HT, bodyguard?

Thanks in advanced for the replies