Here are two sites which have the annual stats for Gretzky and Lemieux:
Gretzky
Lemieux
Let’s look at the first five years of both careers, when both of them were healthy.
In Gretzky’s first five years in the league, he scored 356 goals, and had 558 assists, for a total of 914 points!
In Lemieux’s first five years (injury free, pretty much), he had 300 goals, and 415 assists, for a total of 715 points.
This is probably the closest comparison - both were young and healthy. Gretzky scored 200 points more than Lemieux in the space of five years.
Gretzky won nine Hart trophies for player of the year. Lemieux won three. During the years when both were playing near their peak at the same time, Gretzky won four Harts, and Lemieux one.
Lemieux never cracked a 200 point season (although he got 199 one year). Gretzky had four 200 point or better seasons in five years.
Let’s go a little farther, and add up the points in all of Lemiuex’s years where he was healthy. Let’s take the 12 years from 1984 to 1996, remove his two bad years completely, and come up with a 10 year total.
In his ten best years, Lemieux had 577 goals, and 1112 assists.
In Gretzky’s first ten years in the NHL, he had 624 goals, and 1200 assists.
So in their ten best years, compared directly, it’s pretty close but Gretzky still comes out ahead by 47 goals and 88 assists.
And of course, Gretzky went on to score another 270 goals and 663 assists before his career was over.
I think it is fair to say that at their peak Mario was as good a hockey player as Gretzky, or very close to it. But Mario’s peak was relatively short, and Gretzky’s went on for a long time.
It’s unfair to claim that had Mario been healthy he would have racked up the same numbers as Gretzky, because there’s just no way of knowing. Maybe he would have become unmotivated. Maybe age would have caught up with him faster than Gretzky. We really have no way of knowing. But a direct comparison of their best years seems to indicate that they were close in ability, but Gretzky still comes out ahead.
Both are great hockey players, two of the best to ever lace up a pair of skates.