Right now or long term? Long term, who knows? Right now, the answer is Wilson. He is the most complete of the 4 QBs. The only thing Wilson lacks is height. But he is slippery as an eel. He can throw from the pocket and he can throw on the run with equally great accuracy. There isn't a QB in the league not named Peyton who prepares for a game better than Wilson. Even as a rookie, from day one he was writing and distributing to the team his own scouting report for the upcoming game. For a rookie to get away with that and not be told off by veterans and told to lay low by coaches goes to show that Wilson is just a natural born leader. So, in addition to his great skill set, Wilson has "intangibles" more than any of the other QBs.
Having come into training camp as the 3rd QB on the depth chart, Wilson wasn't named starter until after the 3rd preseason game. That meant that he didn't get starter reps until late in the preseason. Because they were slow to name Wilson their starting QB, the Seahawks started out the year with a very limited (and very predictable) playbook, gradually adding more as the season progressed. Consequently, Wilson did not start his rookie season looking like a phenom. However, in the last 8 games of the year, after the Seahawks opened up the playbook, Wilson had the highest passer rating of any QB in the NFL. Moreover, he was putting up those incredibly high QB ratings while playing the #1 most difficult schedule of opposing defenses in the NFL (based on average ranking of total yards allowed). In contrast, RGIII and Luck played against some of the cushiest defenses in the NFL. With a stat line that looked essentially identical to the stat line that RGIII put up (except for rushing yards) and yet playing the toughest schedule of opposing defenses, the football sabermetrics folks at Football Outsiders and at Pro Football Focus named Wilson as the best rookie QB last year. Football Outsiders stated that Wilson had the best rookie season of any QB in their database (going back to 1991).