I think too much emphasis is put on regular season scoring stats when talking about players in general, and especially with these two superstars who's on-ice value goes FAR BEYOND that single item.
Of course Bossy helped Trottier's scoring stats, and Potvin, and they all helped one another. Bossy helped B.Sutter and Tonelli when Trotts was hurt, Trotts proved he could score without Bossy as well. Same for Crosby, he could put up points with anyone. Do any of them have success without the support of teammates? no. But that's the point. Team success is defined by its leadership and their legendary status is a result of being able to deliver results, often on the shoulders of other great players. Be it Potvin, Bossy, Smith or Malkin, Fleury, and others.
They are/were BOTH great offensive talents, leaders on their team, successful in both playoffs and regular season, playing very well-rounded games. I voted Trottier but it's close and before it's over, I wouldn't be surprised if I voted Sid - he's that talented. But Lindros has shown us that being super-skilled and having all the tools doesn't always mean success.
Adjusted stats aside, Crosby absolutely matches Trottier in vision. Offensively, they BOTH are elite, among the best in the game, among their peers. Obviously playing in an era when 99 dwarfs all your numbers does hurt disproportionately to the Sedins of today, and Trottier went up against Gretzky in two straight finals, two of the best teams ever. Just the fact that MANY in hockey put Trottier ahead of Gretzky (mostly after the 1983 finals) means a lot. That's why I went with Trottier.