Circuit Max and Cardio&Weights differ in the following ways:
Circuit Max incorporates 2 cycles of hi/lo, 2 cycles of floor and step kickbox, and 2 cycles of traditional step, whereas Cardio and Weights uses strictly step for its cardio cycles;
Circuit Max incorporates 6 cycles of 2-minute compound upper and lower body resistance segments with handweights, whereas (I believe) Cardio&Weights incorporates 3-minute leg only, compound and upper body only resistance segments;
Circuit Max's chaptering is somewhat more limited than Cardio & Weights (warm-up, cardio/resistance cycles, upper body and brief abs) whereas Cardio&Weights DVD is chaptered much more thoroughly, offering among other things a timesaver cardio only (step) routine that simply omits the resistance cycles.
I personally prefer Circuit Max over Cardio & Weights, but many here absolutely love CardioWeights. IMHO Circuit Max is higher intensity for cardio work. I'd be interested in others' opinions.
A-Jock