What is the best workout program and why?

With so many great workout programs for putting on mass or getting ripped!  What is your favorite workout?  HIT, P90x, MI40, BFL, The German Volume Method, Periodization, A Body Part A Week, CrossFit, Instinctive Training, or Powerbuilding!  These are just a few there are so many programs.  Tell us why you think a certain program works but please no sales pitches.  We wanta here the real deal.