I picked Evolution for this award. To me, they were essentially a modern Four Horsemen. And just how the Four Horsemen had many different members over the years, Evolution could have essentially done the same and continued to groom stars long after Randy Orton and Batista.
Sure you can say that Triple H's reign was shit at the time due to the lack of a "proper challenger " but it was still great. Evolution helped to build Randy Orton into the star he is today. Sure he is currently not favored by many of the IWC , but nonetheless he is a top heel in the WWE, and without Evolution grooming him into the main event he might not be where he is today.
Now onto Batista, who , when he turned on Triple H, everyone was kind of surprised. I remember when Evolution was playing out, I thought Batista would be the one to never leave Triple H, he seemed determined to always help Triple H and nothing more, which is why it was so great when he won the Rumble and chose to face Triple H. I remember the first time I saw Batista, back when he was a lowly midcarder as Deacon Batista with Reverend DVon, what a change he underwent to become " The Animal " Batista. Anyway, just as Randy Orton, Batista would not be where he is without Triple H. That feud with Triple H, where they had the three rematches, is one of my favorites in recent years.
Evolution also made me a fan of the Nature Boy, and that is why I choose Evolution. It was also one of the last stables in the WWE that actually worked out quite well.