Our school comes from a combined Tracy/Parker lineage and teaches a system which is primarily similar to the Epak system in techniques, but uses a different organization.
We teach
Stance 1 (different from epak)
Blocking 1 (star block)
Elbow 1
Kicking 1 (different from epak)
Sparring 1
Stance 2 (different from epak)
Blocking 2 (star block plus doubles and opposites)
Coordination 1
Kicking 2 (different from epak)
Sparring 2
Breakfall 1 (new set incorporating rolls, breakfalls, and stand up techniques)
Finger 1
Sparring 3
Coordination 2
Striking 1
Stance 3 (different from epak)
Finger 2
Versus (two man set from SOCK)
Kicking 3 (different from epak)
Trapping 1 (new set incorporating 15 different arm traps, tweaks, and breaks)
Staff 1
Spear 1
Blocking 3 (blocking 2 plus a variety of parries)
Finger 3
Several of the sets not specifically described as being different from epak may still be different, I'm not an expert on specifically how things are taught in the epak system. We also teach an informal club set which is basically short 1 with clubs in your hands. As far as my favorite, that's hard because I'm not good with favorites and I also tend to be a bit of a kenpo devotee, but I like the coordination sets for a good hard workout, stance 2 and finger 2 because they have alot of moving around the room, of course the weapons sets and versus set are always fun, gosh, I guess I'm just not going to have an easy answer.
At our school we also teach the forms
Short 1
Long 1
Short 2
Long 2
Short 3
Long 3
Leopard Set
Short 4
Long 4
Mass Attacks
Short 5
Long 5
Tiger Set
Short 6
Crane Set
Long 6
Form 7
I feel that the sets are of vital importance. They are another piece of the puzzle. Basics are taught individually, and then their practice is layered with techniques, sets, and forms. An inward elbow is taught as a basic to be practiced in the air and on pads or the bag. Then the students is taught elbow set, where they practice the elbow strike from a different stance, a different point of origin, with a different follow up strike. Than the elbow is practiced in techniques again with all those different aspects, both in the air and on the body. Then the elbow is practiced in a form, with a different mental component, as part of a much larger piece. Then the student returns to the simple basic inward elbow and sees it in a whole new light. Yes, this is important for beginner students to develop their skill with, and understanding of, the basics. But this is also important for advanced students, not just to continue to sharpen their skills, but also because the advanced student begins to see lessons hidden within the sets. For instance, elbow set one teaches the student to purposefuly open and close the hand when striking with the arm. In this set the student strikes with a different part of the body than the hand itself. However, this lesson is repeated in Sparring set, only this time the student strikes with the hand they are opening and closing. Some would say that this kind of layering of material is tedious and wasteful. I argue that this is exactly the kind of layered, progressive approach which leads to a mastery which goes beyond mere proficiency in self-defense. Self defense is relatively easy to teach. Elbow, knee, hit the opponent where it hurts, ie. throat, solar plexus, knee, groin, eyes. So what. If that is all we are teaching, our students don't need us, and we don't need martial arts. I'm teaching something far deeper than mere self defense, although I am a huge proponent of self defense and focus on it heavily in our classes. I'm trying to make my students into martial artists with a deep and abiding respect and understanding for the study of motion and it's many complex applications.
I work the sets all the time. In my black belt classes, we often warm up by running every set and form in the system. A practitioner is only as good as his or her basics, and the sets group similar basics in a format which makes them easy to practice as unique skill sets, as well as providing an opportunity to compare and contrast the differences in the similarities and the similarities in the differences within those basics. I also come into the studio and check my neutral bow several times a week to make sure it stays sharp. Just because I've learned it doesn't mean I've mastered it, and just because I've mastered it doesn't mean I'm done with it.
-Rob