In my mind, this award comes down to four individuals: Randy Orton, CM Punk, A.J. Styles, and Jeff Hardy. All four of the individuals are deserving of this award. Let's take a look at their year's to determine which one should be Best Wrestler of the Year.
Orton started out the year with a bang by winning the 2009 Royal Rumble. He would go on the challenge Triple H for the WWE Championship at Wrestlemania 25. Despite the fact that Orton lost the match at Wrestlemania, he developed a long running feud with both Triple H and Batista. He would claim his third WWE Championship in an unusual fashion, by pinning Triple H in a six man tag match at Backlash. Orton would lose the title to Batista in a Steel Cage Match at Extreme Rules, but Batista would be injured and the title would go right back around his waist, winning a Fatal Four Way match on Raw against Triple H, Big Show, and John Cena. He would hold the title almost three months after that before he embroiled himself in a nice feud with John Cena, where the two traded the belt twice. At the end of the year, his production has dropped off, but I enjoy the feud with Kofi Kingston because it gives Orton a nice heated non-title feud on the year.
CM Punk's year started out with an Intercontinental Title feud against William Regal, which ended with Punk winning the championship and becoming the 19th Triple Crown winner in surprisingly fast fashion. After dropping the title to JBL, Punk would go to Wrestlemania and become the only wrestler to win back-to-back Money in the Bank matches. He would leave Raw for Smackdown via the draft and go into a feud with the late Umaga. Those two traded blows before the feud ended at Extreme Rules, as Punk won in a "Samoan Strap Match". Just before the pay per view ended, Punk would cash in his "Money in the Bank" contract on Jeff Hardy after his brutal ladder match against Edge. The result would be Punk winning his second consecutive World Heavyweight Championship on a Money in the Bank cash in. The move would lead to Punk's heel turn and a great feud with Hardy. The two fought in the pay per views to following, including the incredible TLC match that the two had at SummerSlam. In the end, Punk would defeat Hardy in a match where the loser had to leave WWE. Then the Undertaker feud began, as he reappeared in the WWE after the TLC Match at SummerSlam and assaulted Punk. The two fought in a re-work of the Montreal Screwjob at Breaking Point. Punk would lose the championship to Undertaker at Hell in a Cell after Punk ended up in the "doghouse" with WWE Management. The rest of the year has seen a tremendous downfall, as Punk has continued to work his "straightedge" gimmick further. He has since feuded with R-Truth and aligned himself with Luke Gallows, aka Festus.
On to Jeff Hardy now. He started out the year in his first reign as the WWE Champion, but had to deal with brutal attacks at the hands of a mystery man. Hardy would only hold the belt a short amount of time, as he would lose to Edge at the Royal Rumble and we would find out Matt Hardy was the man behind the attacks. The two fought to a feud all the way to Wrestlemania in an Extreme Rules match that somewhat disappointed. Hardy vs. Hardy continued in matches on Smackdown and finally finished at Backlash, when Jeff defeated Matt in an "I Quit" match. Hardy would instantly go into a feud with Edge and the two fought in one of the year's best matches, a ladder match. The ending saw Hardy pull Edge through the rungs of the latter and climb his way to the top and win his first World Heavyweight Championship and second world championship reign overall. However, CM Punk would cash in his "Money in the Bank" contract on Hardy and win the title. The two fought in a brutal feud that saw Punk retain at the Bash, Hardy win at Night of Champions and finally another instant classic from Hardy on the year; a TLC match at SummerSlam between Punk and Hardy. Punk would win the championship after knocking Hardy off the ladder. The two would fight one final time on Smackdown in a Cage Match, where the loser left the WWE. Punk would escape the Cage and let Hardy kayfably leave after his contract expired. Will we see Jeff Hardy again? I would think so, but nothing is certain. I would love to see a Punk/Hardy feud at Wrestlemania, with him returning at the Royal Rumble, but I doubt that happens.
Finally, we have A.J. Styles. He would start out the year feuding with Kurt Angle. He would move from that feud after getting kayfabe injured and go into a feud with then Legends Champion Booker T. At March's Destination X, Styles would win the Legend's Championship and become the only man to win the TNA Grand Slam Championship. Styles would defend his championship at the Sacrifice pay per view, after Jenna Morasca threw in the towel for Booker during an "I Quit" match. Styles would go on to compete in the TNA World Heavyweight Championship match at Slammiversary Seven, but failed after Samoa Joe turned heel and helped Angle win the belt. Styles would lose his Legend's Championship to Kevin Nash (in a horrible match) at Victory Road. His bid for a claim at the TNA Championship would be denied by Matt Morgan, who defeated him in a Best of Three series to advance to a triple threat match at Hard Justice. Styles kayfabe retired, but Sting talked him back into wrestling. At the No Surrender pay per view, Styles would win a five way match against Angle (then champion), Matt Morgan, Sting, and Hernandez to win his first ever TNA Heavyweight Championship and became a four-time World Heavyweight Champion in the process. Styles first title defense was against Sting at Bound for Glory IV, which was billed as possibly Sting's final match. Styles would come out victorious in a match that somewhat disappointed. Styles second defense was a remake of the very popular "Unbreakable 2005" match between himself, Samoa Joe, and Daniels. He would retain, but wasn't finished with Daniels. Styles will defend his championship this Sunday against Daniels.
After looking at these resumes, it is hard to give one wrestler the award because these four have done well. However, I give my vote to Randy Orton. The guy finally got the chance to have a year to himself and he delivered. "The Viper" delivered in getting heat in his feuds with Triple H by kissing wife. He continued to make the punt an effective tool that knocks out opponents. He put out Triple H and Batista (although through storyline), which helped his bad guy cred. He also added Royal Rumble winner to his resume, which helps make him legitimate. The formation of Legacy also made him "Triple H-esk" or "Ric Flair-esk" in the fact that he had his own stable of goons to lead. His feud with Cena was very memorable and brutal with the trading of titles. He is still delivering even now in his feud with Kofi Kingston.
I would give a close second to CM Punk. He is the fastest man to a Triple Crown Championship, taking seven months to win the World Heavyweight, Intercontinental, and World Tag Team Championships. His feud with Jeff Hardy will be the most remembered thing for Punk this year. The reason I gave the nod to Orton because Orton has delivered all year, where as Punk has had some down moments (feud with Umaga and here recently with R-Truth). I know a lot of that is poor booking of the wrestler, but I still would make the argument that Orton is just a tad bit better this year than Punk.