If you've already got any of the BB cardio workouts, I would go with CTX. I think the weight work in CTX is better, and the cardio is lifted from the BB workouts. They've just used short sections of it. CTX cardio is all original.
If you don't have the BB workouts and don't plan to get them, the Timesaver does provide a good sample of what they're like. If impact is an issue, the Timesaver has less impact than CTX cardio.