I like both, and they are so different.
It somewhat depends on what your goals are and what you need in your collection.
As you mentioned, PH comes with MIX and BodyMax, two excellent workouts, so on one DVD, you get an endurance workout, a full-body strength workout, and a killer, long cardio + weights workout.
The Pyramids, however, are probably my favorite Cathe weight workouts (Gym Styles are vying for that spot!). I do modify by putting in longer breaks between sets on the lower body workout. Otherwise, PLB is pretty much a perfectly balanced lower body workout (even without the stability ball work).