If money only grew on trees...
I think that S&H is really good for busting through your strength plateaus, but is probably not a "NEED." The very first time I used S&H in a 3-week rotation, it added some bulk for me to my upper body, but that was smoothed out by going into a six-week muscular endurance rotation. The end result was some nice, firm, defined muscles in my upper body (although still covered by that stubborn layer of fat).
As far as the legs and abs go, well they are another story. As far as I can tell, the S&H didn't do much for the way they look, but I did feel stronger after that rotation in the legs.
For me, my DH already noticed my butt and gut looking smaller with the new Pyramid/Intensity series rotation I am now doing.
I guess if I had to pick, I would say go for the pyramids. I think they are more fun and my trouble spots are my lower body, which DH thinks they are helping. So, S&H is probably not a "NEED."
Good luck with whatever you decide! And don't be like me and let your eating sabotage your hard workout efforts!
Linda