Sometimes we need to take a breath and remember that Hockey Ref.'s "Adjusted Stats" are not actually, you know, real stats. One has to -- at minimum -- apply a little context and logic to them. They are certainly useful, as I said upthread, to give us 'ballpark figures' of how historical seasons
might look under "normal" scoring conditions in an 82-game schedule... but that is all. (The flaws of adjusted stats are numerous and have been discussed many times in other threads.)
As I explained already, over a 636 / 676-game span in each's prime, Lemieux and Ovechkin scored (respectively)
0.88 goals per game (171 point pace) and
0.63 goals per game (93 point pace). That's a difference of 20 goals per season (and 78 points per season) -- over eight seasons -- in favor of Lemieux.
Now, the adjusted stats will tell us -- as
@MadLuke showed, above -- that Lemieux also had not one but
three peak goals-per-game seasons better than Ovechkin's best single season of 2007-08. (Lemieux isn't alone in having three seasons peaking higher than Ovechkin, either -- I would say Gretzky and Hull Jr. did, also, and it's probably debatable about Richard, Hull Sr., Esposito...)
In addition, we know that Lemieux did quite well (as
@MadLuke , again, summarized nicely, above) in high-level international competition as a goal scorer. Conversely, Ovechkin has been relatively disappointing in this particular area.
Further, although both were superior playoff goal-scorers, I would say Lemieux in his prime (not 2001) was better than Ovechkin. From 1989 to 1997 (seven playoffs), Mario scored 70 goals in 89 games. Discounting the past three underwhelming playoffs, Ovechkin from 2008 to 2020 (twelve playoffs) scored 69 goals in 136 games. That's 1 fewer goal than Lemieux in 47 more games. Sure, we can "adjust" that discrepancy down somewhat per era, but Lemieux still wins easily.
So, let's add up the factors I'm taking into consideration here:
1) In each's best years, Lemieux scored 20 more *raw* goals per 82 games than Ovechkin. Adjusting that down for scoring environments, the difference is of course a lot closer, but Lemieux still wins.
2) In international hockey, Lemieux was clearly a better goal scorer.
3) In the NHL playoffs, Lemieux was clearly a better goal scorer.
4) While being a slightly better goal-scorer, Lemieux was also putting up 60-70-80 more points per season than Ovechkin. This obviously suggests that if Lemieux had played more like a winger than a center (i.e., less focus on playmaking), he almost surely would have scored more goals. (The same certainly applies to Gretzky's younger seasons, too.)
I understand that point (4) is pure speculation and not based on actual results, but when the preceding three important points that
are based on actual results show Lemieux ahead in each category, I think then the context of each player's style / role also needs to be taken into consideration.
Anyway, the topic of "best goal scorer" is always a fun thread topic because there are different ways to look at it and not really a clear 'winner' when all points are taken into consideration. Again, much of this comes down to what one values most in players.
As I've stated many times on here, I'm less impressed by good aging and longevity than many people are, and I'm more impressed by (what I call) a player's "consistent prime", by which I mean consecutive seasons in a row at an elite level. Lemieux himself falters somewhat in this area, as he wasn't able to stay in the line-up long enough to put together a lot of elite and full seasons in a row. But overall he certainly played enough games, had enough full or near-full seasons, and was elite as a goal-scorer long enough (basically Jan. 1985 to April 2001, which is over sixteen years in span, albeit with many missed games/seasons) that I generally consider him the best goalscorer in hockey history.
Finally, I hope that certain Ovechkin-enthusiasts will note that I am not dissing the great man by rating him at the second-best goal scorer in the ENTIRE HISTORY OF THE SPORT.