This was hard for me to vote on. I chose HC series b/c I do workouts from this one the most right now, but I really use and love them all. I don't know which series I would pick if I HAD to choose to be really honest. I enjoy different things about all the series:
I-Series - I just really enjoy all the workouts but I wish there was more cardio, also love the premixes.
BB Series - I love the cardio options and the shorter, less intense weight work and the premixes and music louder options.
HC Series - love the weight work and the cardio in this one. I like to use the workouts as is but also to use making my own mish moshes and mixing and matching.
I like and use all of the older series in one way or another.
Angela:7