References from April 2006 and August 2006
http://forums.elitistjerks.com/topic/76 ... ntry177217
Lastly, the way enchants like Crusader works(as in, it can be on a variety of weapons), they are set at 1PPM, but that's 1PPM based on unhasted auto-attack. The proc rate goes up once you start throwing in haste and yellow attacks. So, slower weapons gets high proc rates in this system.
http://forums.elitistjerks.com/topic/61 ... ntry130491
PPM is pretty easily misunderstood; the way it seems to work is that the game internally converts it to a chance on hit percentage, with that percentage defined by the speed of the weapon and the "ideal" PPM, such that if all you do is autoattack, and all your autoattacks were hits, you'd get that many PPM.
As I said in earlier posts, PPM is not part of the game mechanics, it's just an easier way for players to talk about variable proc chances.
In reality, you can increase your PPM by spamming more instant attack abilities like hamstring or increasing your weapon speed with abilities like slice and dice.
To answer the question in the OP, Lifestealing has a proc chance 6x higher than crusader.
Note: I have not tested this myself on the live server yet so do not take this as official word on how it works on Nost. If you find results that differ, please create a ticket in the bug tracker.