P90X vs. insanity workout?

I am thinking of getting a series of work out DVDs. The ones I see the most advertised and seem to be the best are P90X and insanity workout, but I don’t know which one is the best? I was hoping someone would let me know. I want to lose lots of fat, gain mussel, and to get more endurance, I’m tired of being the friend that’s out of shape. So if you could let me know which one is better, how they both work, or just let me know if there both scams, Oh and how much they both cast. thank you :)