Pippen by a mile. His defense on Magic in the 91 Finals was the turning point in that series. Say what you want about Wade scoring in 2006, but Scottie's defense on the 2nd best player in the league was a sight to see.
Stacked up against Wade he's a better defender, rebounder, passer and ball handler. He would often bring the ball up and facilitate the offense. As good as Wade is on the fast break, Scottie was better. He could finish strong at the rim or make the right play to whoever was with him on the break.
I also can't stand Wade and Pippen was one of my favorite players. Just as a basketball fan I think that has to factor into the equation.
As far as top SFs I've ever seen he's right up there after Bird, Lebron, Durant with Grant Hill, T Mac and Nique (at their peaks). Never really saw Havlicek, Dr J, etc.
Wade is also an undersized 2 guard that would have trouble guarding bigger guys like Jordan, Kobe, Drexler and Penny in the post.