The Biggest Loser DVD's have Bob, Jillian has her own DVD's (I think there are 4 now?)- they are Winning by Losing. There is another thread for those of us doing Jillian's workouts, it is
here. There are books from each trainer as well....either one will kick your butt by the sound of it, I haven't tried the Biggest Loser DVD's - but there is no shortage of testimony here at 3FC that Bob's workouts are tough.
As to which is better? There is no right answer to that - Bob & Jillian just train from different perspectives. If you watch the show you might have already noticed that. Try em both - see which you prefer? For me, DVD's get boring after a while - more choices might be better for variety. Jillian's book has a whole 12 week workout routine that you do on your own...for a third choice.