Which of these workout programs will work best?

Are you a male or female??

I completed 2 rounds of Insanity at first and now I am on my second round of Turbo Fire. I think it also depends what you are looking for.

Insanity I found since it was intense cardio it stripped weight from my thighs, rear and core. I found it did lack in my upper body. Turbo Fire does have sculpting bands and I feel it made my overall body strong. The music is fun.

Turbo Fire is 90-120 days depends if you extend it and Insanity is 60 days.

Also what is your fitness level?? Insanity I feel was top on the line intensity and what I find is people who do not workout get discouraged sometimes on Insanity because it is intense. Turbo Fire I feel you can work your way up to a desired fitness level - starting you out with 15 minute HIITs (high intensity interval training) and 30 minute Fire workouts.

You can do P90X2 before P90X, but ideally you would want to start with P90X

It is all of what you are looking to achieve - the 4 above are great and you will see results with all of them with proper nutrition - good luck on your decision!

I find that Asylum vol 1 and 2 work best, but out of those four p90x2.

It's recommended to do p90x prior to doing p90x2, but not needed.

Depends on what your goals are. Want to lose weight? Insanity is amazing. I lost about 15 pounds on it pretty quickly. P90X has different routines for different goals but I've seen my friends put on a great deal of muscle with it either way. Research them in regards to what you are looking to accomplish and you will find your answer.