I agree with Barbara. Pure Strength will define your muscles. Slow and Heavy will let your muscles build more. I believe Cathe says in SH series, that this should be done is shorter rotations because there is a lot of mental preparation to do these workouts.
Susan C.M.
I would say Pure Strength because you can use it for a long period of time where with the Slow and Heavy you shouldn't. Maybe someone can chime in here and explain why because I can't remember what reason.