Malkin put up 98 points in 2017-2018. He almost DOUBLED the points that Toews put up that season. No amount of defense closes that gap. None. In 2011-2012, Malkin again almost DOUBLED Toews' points.
Malkin has 8 more points than Toews this season, in 16 less games...
Malkin is also an absolute monster on the power play. Which, again, is another part of the game. One that allows Pittsburgh to stay in games they shouldn't, and win games when they are banged up.
Nobody is arguing that Toews isn't better defensively, but Malkin isn't Patrick Kane out there away from the puck. He is not BAD defensively. He is not a floater. He is tenacious on the forecheck and backcheck. His physicality is probably a big reason he misses a lot of games.
Toews was a better center for a handful of seasons during their careers. Outside of those few seasons, where Toews was a two-way monster, who also produced offensively, it's Malkin. And I say that as a guy who hates Malkin, because of how dirty he often is.