Very close - 2 of the best 36 year old seasons of all time.
Ovechkin by a bit for me, as points relative to the rest of the league are about a wash, but Ovechkin was 4th in the league in goals while also missing 5 games. He also had 108% more goals than #2 on his own team. Truly carried their goalscoring.
Up until the Guentzel trade, Guentzel had 52 points in 50 games (a higher point/gp than Crosby who had 63 in 61). And only had a 45% lead on him in goals. Since that trade Guentzel has been the Canes best player and has shown he didn't need Crosby to produce. The counter part is that Crosby has been amazing himself (but at the same time, Malkin and Rust have finally woke up, and Bunting has been fantastic for them too).