Ovechkin is rocking an insane 107PDO at 5v5 this year with a 45% xGF%. I’d give him the edge this year as you still have to score the goals but I don’t think he’s as good as Crosby was last year or the year before. Granted Crosby was giving up a ton defensively, but he was also one of the best 5v5 scorers. Impressive is subjective, but I think Crosby was definitely a better player.
I think people like wetcoast are having a difficult time trying to reconcile on-ice results with perceived ability, and while luck can be a factor when it comes to scoring goals, I think it can be too dismissive and reductionist to just say that because a player is shooting at a very high rate, he's simply getting lucky.
Ovechkin is the greatest goal scorer of all-time. He's an outlier when it comes to goal scoring. There's a reason he has nine scoring titles, will soon hold the goals record and has 200+ goals in three different decades. He fundamentally excels at scoring goals, and I think some mischaracterize him as an entirely toolsy player who isn't very adaptable. But I think if you've proven to be that proficient at goal scoring over such a lengthy period of time and you've changed your approach more than once, there's more to your game than just physical tools and shooting ability. He can adapt.
At this time, he seems to have changed his approach from being a volume shooter (which he has traditionally been) to be being an efficiency shooter. When he was shooting a ton and getting his ~50 goals, some would criticize him for "shooting too much" and allude to his accuracy not being as good as that of some of the other great goal scorers. But when he scores a lot without shooting a ton, it's PDO.
PDO is a factor to an extent, but I think he's taking advantage of a system that emphasizes scoring chance quality over volume and he deserves credit for that. A lot of scoring wingers aren't great defensively; some get more exposed for it than others do. Obviously he has had very good goaltending and has a strong blue line behind him to help his GA numbers. But I think the fact that wingers can be sheltered effectively highlights that winger defense isn't that inherently important (at least in comparison to the primary responsibilities of wingers). You can design systems and delegate responsibilities in ways that make it so that the defensive play of your star offensive wingers doesn't really hurt your team (think of all the success guys like Kane and Kucherov have had on well-coached teams).
Crosby's overall on-ice results were generally better than Ovechkin's for a number of years. Now that they really aren't, you have to wonder how much systems, usage, teammate support etc play into things. But then again, to fully take advantage of being on a strong team, Ovechkin has to integrate into his team and system in a way that maximizes his capabilities. This is a guy who has been called too individualistic in the past and accused of not doing what's best for his team (not that I necessarily agree personally). He seems devoted to playing winning hockey while chasing the record.