I'll be different and say Kevin Durant. Get him another ball handler and bigs while he gives you an efficient 30-48 points every night. Also an iron man besides this season. Would have 1 or 2 rings by now if not for Russ and Ibaka getting hurt folloeed by his own injury last season.
There's no real bad answer here for all the serious choices.
I agree with the KD pick because his game is very consistent and never really wavers. He doesn't need the ball all the time. You just have to pretty much optimize the talent around him, and he plays the SF position traditionally so you don't have to worry about how other pieces around him play unlike LBJ. KD can play with pretty much anybody and be great.
AD/LeBron are tied for the second best answers