Cathe has posted before about the differences in results between her different weight workouts. Does anyone know the link?
Basically, the split workouts (eg PS, S and H) are geared towards greater strength and muscle size gains because you work each muscle with heavier weights and shorter sets. The total body workouts (eg MIS) increase strength and endurance. The degree of each depends on your current fitness. For example, if you are new to weights, MIS would increase your strength. If you are used to weights, it would probably give you more of an endurance workout.
It is a good idea to spend at least a month on each kind of workout to see what results you get. For example, start with MIS and Power Hour. Then, try the Pure Strength series. Then, try Slow and Heavy. You can find what you prefer, or just carry on rotating.
To build mass, you need to do several short sets (eg 3 sets of 8-12 reps) with as much weight as you can handle with good form. The amount of weight that you increase by isn't exact. If the set becomes quite easy, increase a little until you find a more challenging weight. Write the weight down, and keep monitoring how easy/difficult the sets are, and increase when you feel ready.
Hope this helps.
Sharon.