Hi-
IMHO, while both series are optimal for strength training, S and H is much more hard core and focused than PS.
If you don't build muscle easily and that is your goal, than I would higly recommend S and H.
But, if you are just looking for a good, well rounded strength workout than PS will be great. You will definitely make gains.
The beauty of both is that you can make it as hard or as difficult as you want by just increasing your weight load. You really won't "outgrow" either of them.
Hope I helped.
Lynn