Hi, my favorite is the total body one with the black/red outfits. It's a long workout that can be broken up easily and a lot of content for the $$$. I really like the all fours work for the seat and back, and the pushup series. The abs and standing legs and arms are also really good!
I think my second favorite would be the band sculpt workout. I distinctly remember the side laying work for the seat and how the band really made me feel the burn
I haven't done the other total body one (by the pool) in a long time, but I remember being underwhelmed. I can't recall why though. Hot flash hottie was very good but a little easier than the others, as expected.
I can't speak to the prenatal workout one way or another.