The best classic rider should be able to outperform in the biggest one-day races with a top field. Generally these are the monuments, a few WT one-day races with a strong field (such as GW, Amstel and FW) and the championships (EC, WC, OC). MVDP has the most wins and the terrain were he outperforms (spring classics or similar) is also the dominant terrain.
Something went wrong here: In the races you listed, so ignoring the "such as" VDP has 10 wins. 8 monuments, Amstel and WC. If "such" includes E3, it's 12, if it includes Strade Bianche, it's 13, if it includes Dwars it's 15.
Pogacar? 9 monuments, 2 Flèche, 1 Amstel, 1 WC, 13. Nothing changes if you include E3, add Strade Bianche and he's at 16. No Dwars so he still is at 16-15
And then there's nothing to add for VDP basically. Ok, Brabant. But add Brabant, then for Pogacar you can find Emilia, Tre Valli, Montréal.
But of course it's Pogacar. He starts as clear top favorite in 2 monuments. VDP starts as favorite, but not nearly as clearly in 2, and I actually would give him a slight advantage in RVV too. The difference then is, he's hopeless in Lombardia and it would take a LOT of stuff falling into place for him to win Liège, like a team with Remco, who can follow Pogacar and doesn't ride, and Wout who then decides to bury himself for VDP... Pogacar? Sanremo, he can win it. Roubaix the same. It doesn't take that much of a everything going right for him to win it there. And he can win basically all the classics VDP has won. E3? Sure. Harder for him than the Ronde, but on the other hand the field isn't as strong as the main event later. Dwars ok, even harder to win not selective enough, but there really the starting field is weaker again. While for VDP there's countless races that he won't win, he doesn't stand a chance, for Pogacar it's much fewer.