#1 Batista (2005-06)
While Edge was the greatest World Heavyweight Champion in WWE history, Batista had the best reign with the belt. At 282 days, the Animal's run on top of Raw/Smackdown was a big hit. He, unfortunately, had to vacate the title after suffering a nasty triceps injury but what he did before that was incredible. Batista won the big gold belt in the main event of WrestleMania 21, destroying Triple H. He would continue to feud with the Game throughout the spring, with the rivalry culminating in a terrifyingly brutal Hell in a Cell match at Vengeance.
After that, Batista was drafted to Smackdown. His first feud on the Blue brand was against JBL, with the Animal standing tall after a No Holds Barred match at SummerSlam. He faced Eddie Guerrero at No Mercy, Guerrero's final pay-per-view match before his shocking and untimely death. Batista even won the WWE Tag Team Championship with Rey Mysterio as 2005 was coming to a close. He would have likely kept hold of the belt until at least WrestleMania 22, but injury got in the way.
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Despite being cut slightly short, Batista's 2005 reign with the big gold belt was the best in its eleven years.