I'm going with Sakic
The Nordiques/Avalanche had a .588 winning percentage under Sakic. Detroit was 0.563 under Yzerman.
Yzerman 0.457 (46th)
Sakic 0.454 (48th)
Sakic 1.191 (12th)
Yzerman 1.159 (15th)
Seasons with greater than 1.00 pts/game
Sakic 16 (in 20 seasons or 80% of his career)
Yzerman 13 (in 22 seasons, or 59% of his career)
100 pt seasons
100 pt seasons past the age of 30
2 Sakic (only Phil Esposito and Marcel Dionne did it more)
0 Yzerman (last did it at age 27)
Top 10 Sscoring finishes
10 Sakic (last at age 37)
6 Yzerman (last at age 34)
Post Season All-Star Teams
Conn Smythe Awards
Canada Cup/World Cup/Olympic Appearances
Sakic is one of two Canadians to win a Canada Cup, a World Cup, a Stanley Cup, a World Junior Championship, and a World Championship (Scott Niedermayer the other - and Nieds has a Memorial Cup too)
Sakic has the 3rd highest points/game average after the age of 30 in NHL history (not surprisingly...Gretzky and Lemieux are 1st and 2nd)....Yzerman is 28th
Sakic is the 2nd oldest person in NHL history to record 100 points (only Gordie Howe was older)
In 2006, the Hockey News picked their 60 greatest players since expansion.........Sakic was 6th, Yzerman was 8th.
Only once in Sakic's career did he average less than 0.9pts a game (his final season where he averaged 0.8). Yzerman did this 5 times.
Statistically............Sakic has it all over Yzerman.
Again, I love both players, but the numbers don't lie.