To answer this question all you need to remember is this: Forsberg was the one that faced the toughest assignments in the playoffs. Lidstrom, Hatcher-Matvichuk, Norstrom, Hannan. And yet he always performed.
Sakic redeemed himself in a BIG way in the 01 playoffs, when he put the team on his back offensively after Forsberg went down. But in the two years prior to that he would go MIA at times and was heavily criticized for it, especially against the Stars.
And even in 01, we would not have gotten past the Kings if not for Forsberg.
While Sakic had the better career, Forsberg was the better, more complete player.