I have never liked Butts and Guts. I have yet to do Lower Body Blast so I cannot compare.
However, I have always liked GS legs and when I do my own lower body routine at the gym, it is the standing work from GS legs that I do. I like the twist Cathe gives to the basics in this DVD.
--3 sets of squats, 16 reps, then add bonus burn low ends on to the last set
--2 sets of front lunges with 15, 7, 7, 3, 3 low ends (something like that, I vary mine: burns like hell)
--2 sets of rear lunges with single reps added on, fast pace, burns out the leg nicely
--plie squats, 15 reps, then 2 sets of low ends added on
--deadlifts
The floor work section uses the stability ball and it is excellent. If you are a runner, this is a very useful section to perform. A lot of hip, hamstring and glute work that is tough, focussed and will help prevent running injuries.
Clare