Both are filmed outdoors. In both Margaret is working out alone.
Triple Threat is a split kind of workout. Half is upper body and half lower body with three chapters for each half, each chapter has exercises for three body parts...say, pecs, tricepts and biceps in one chapter. I think each chapter is about 20 minutes. The individual muscle routines may be chaptered. I haven't done Triple enough as I don't generally do splits (except CLX
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Good'n'Strong has two full body workouts on the dvd. No splits...total body workouts. She uses a little playground-type ball in this one, but I really think you could do this one without a ball.