I have to go with Wilt as the best player to ever play in the NBA. I know he has his detractors but the guy was the most dominant presence the league has ever seen. You need a player who can score, well no one ever did it better. Keep in mind, Wilt scored 50 or more at least 10 times more in one season then MJ did in his career!
You need rebounding, Wilt was the best rebounder the league has ever seen, leading it 11 times in his 13 year career. Russel was a close second but I give the edge to Wilt due to his height and strength.
If you need defense Wilt can supply that at whatever level you need it. I know Russ gets credit for being a better defensive player, and maybe he was, but let's not forget that Wilt's teams asked him to do both, play D and score as well as rebound. Russ really was not counted on to score to make his teams win.
Now, if you think another player should be listed try substituting Wilt onto that team and take away the other player. Would the Celts have won 11 titles in 13 years with Wilt as their starting center instead of Russ? It's hard to say for sure but they may have won em all!
How about MJ's Bulls? With the teams they faced putting Wilt in their instead of MJ might have made them much better. Wilt could do everythig Jordan did and much more!