I know this is sort of an older post, but I was looking into these two just recently and have found out in other reviews that 30ds has much less cardio than Fat Blaster.
I just ordered Fat Blaster. I'm thinking that between using it with the gloves and the cardio involved, I should get a more balanced workout than with 30ds.
Started My New Life 01-07-09
2.14.09 Goal: 167
3.17.09 Goal: 155 10%!
4.12.09 Goal: 146
6.1.09 Goal: 133
7.4.09 Goal: 127
GOAL 9.1.09: 115-33% of me gone