Both are not purse chance on hit.  They are based on weapon speed.  Thus, my 3.8 hammer will proc crusader every few hits, while a 1.0 dagger will proc it like once ever 15 hits.  Weapon speed is calculated, so it's not like putting it on a 0.2 dagger will make it proc more.  Put it on a 3.80 hammer and it will proc every few hits.

Also, lifestealing procs 6x more than crusader does, but doesn't give +str of course, and steals less life per proc.  However, on a very slow weapon I've seen LS proc every other hit faithfully, which is very nice.