I agree with Stacy - they are so different and both so great. If you are wondering about which one to purchase I always suggest people err on the side of caution and get both. You won't be disappointed. Abs circuits can be an add on or a quick stand alone workout. Butts and guts is a long workout for legs and abs - which can be broken up and done all together. both are great and I use them both. I hope that helps a bit.