First, I love Shaun T. He motivates me even when I want to scream at the TV (and yes sometimes I do and its not a pretty site at all). He is fun, upbeat, and pushes you to dig deep and nail it, at the exact moment you want to give up, so you really cannot go wrong with either program. Both will get you results. The approach is just different with each program. Which you choose, depends on you.
The Alpha and Beta phases are 30 minutes Sunday through Thurs. Friday is 30 min videos (some people do the 2nd video on Saturday if there is a time restraint on Friday since Saturday is your free day). The videos go right into the work out, there is no warm up and no first stretch. You gradually warm your body up in the video and about the time you think you can't do anymore it's over, 25 mins time is done. Once the work out is over, you get to stretch for 3ish minutes. I personally stretch longer, as I don't think the stretch is long enough, especially for beginners. My suggestion is to stretch longer than what Shaun T does so that you are not sore. Alpha phase gets you ready for the Beta phase while focusing on the lower body and cardio. Beta phase steps it up a notch, but moves on to continuing cardio, while incorporating more core and upper body. After Beta, comes Gamma, which you have to purchase separately but is TOTALLY worth it. It is my fave phase. Gamma phase is 30 minutes a day, 6 days a week and most days you have weights in your hands (which I LOVE).
Gamma is strength and endurance and definitely steps it up another notch and loses most of the lower body really focusing on cardio and upper body. I did a review of all the T25 work outs: http://jamielasterfitness.blogspot.com/search?q=t25 and even did video posts on some of these, so you can see me post workout, when I am a sweaty mess, giving you a run down.
SummaryBoth are excellent programs. The results come with both are about the same. I think T25 scares people less. More people seem to like and finish T25 vs Insanity. Both are excellent all body work outs. With T25 I like the addition of weights and the fact it is a really good work out that is done in 30 minutes. I personally love Insanity as it is all body weight and cardio that shapes your body, but find it harder to fit in the work outs with a busy schedule, where I can always get in 30 minutes a day even if it is after the babe has gone to sleep, on my lunch hour or before everyone wakes. I have no excuse not to work out with T25 where Insanity, I may not always be able to do a work out especially in the 2nd month if I have time restraints or wake up late. Both programs help you drop pounds and shape your body in a few months time. The one you chose really comes down to will power and which fits yours lifestyle better.
Hope this review helps if not contact me if you have questions:email@example.com / http://beachbodycoach.com/jlgray22 / https://www.facebook.com/fitnesswithjamie
I am happy to answer any questions!
Have a very fit day!