Yes, PS has a faster tempo and you don't spend a full half hour on each body part (except legs which gets a whole tape). I like Slow and Heavy, but I don't always have time for it. PS is great. You can do both the upper body tapes in one day, it only takes an hour and 15 minutes, especially if you skip the second warmup.
I like them both but they both build strength and if you could only get one, I think it should be PS.
Last thing though, the SH tape includes forearm and shoulder rotator cuff exercises which aren't included at all in PS. PS includes leg floor work which isn't included in S/H.