If playoffs is included, Sakic easily.
RS alone, quite similar. Think I prefer Forsberg.
Sakic, very comfortably. Barely second to Jagr in points, would have finished first if not for Lemieux's comeback and way ahead of #3 Elias. Second in Selke voting (not that he was actually the second best defensive forward in hockey but he was very good both ways) and second in goals. Even went on to have a Conn Smythe worthy playoff run. Forsberg was also good both ways (fourth in Selke voting similar situation to Sakic) but he barely beat out Naslund for the scoring title and wasn't so far ahead of Thornton in his breakout year or even his linemate Hejduk. Playoffs were good but not great. Sakic won the Pearson, Forsberg didn't. Both players convincingly won the Hart, though Sakic had a bigger margin of victory.
All about opportunities.
Sakic was 5th in total TOI among forwards. (about half a minute less than Jagr)
Forsberg was 71st in total TOI among forwards. (about 183 mins less than Naslund, 178 mins less than Hejduk, and 287 mins less than Thornton)
Sakic was 3rd in total ES TOI among forwards (about 21 mins less than Jagr), and finished 2nd in ES scoring - 12 ES pts behind leading Jagr.
Forsberg was 57th in total ES TOI among forwards (about 84 mins less than Naslund, 128 mins less than Hejduk, 222 mins less than Thornton), and finished 1st in ES scoring - 8 ES pts ahead of Thornton.
The narrative that people try to put out their with 'barely beat' Naslund is obviously true, but only because his opportunity was very limited. Find me one other player that finished top5 in scoring that was outside top50 in TOI.