If I have LeBron, Melo, Durant, Dirk, Rose on my team, obviously Pippen. If I have Howard, Amare, CP3, KG, pretty much anyone else, then obviously Wade.
We're talking about two underrated players here. Wade is the 2nd best player in the league, and easily as good as LeBron in everything except facilitating (which he is still above average at). He is good enough to put ANY team in the championship discussion.
Pippen on the other hand is much more replacement. As a player he isn't, but as a championship piece, Wade is more valuable. If he's already on a team with a ball-dominant offensive option, then he's the ideal compliment. But if you have to take 1 guy to build around, I wouldn't take Pippen over Wade because any defensive stopper would work with him, whereas it'd be much harder to find a Wade-type level of talent to pair with Pippen.