If you want a good, solid cardio workout that puts emphasis on the lower body, and fun music then Low Max is great.
If you want a very challenging high intensity Circuit workout with great music and less challenging cardio, then I would choose Low Impact Circuit.
It's a tough call between the two videos.
But as the other posters point out, Low Impact Circuit has more choices including an all cardio one. It may be low impact, but it is high intensity!