Time for a bit of lunchtime Wikipedia-ing
If we limit 1 day races to Monuments it's
WVA 1, (really? double checks. Yes, just one)
MvdP 8,
Pog 9.
For Tour stages it's
WVA 10 (and 1 Green jersey),
MvDP 1,
Pog 17 (and 4x White, 2x Mountain, 3x Yellow jerseys)
Then there's the quirky fact that Wout won ITT, mountain and sprint stages on his way to green in '22.
And then there are CX word championships which WVA and MvdP were dominating neck and neck in the late 20-teens but which MvdP has monopolised since. Which was roughly when they both moved into the top rank of road racing. Mathieu kept his CX dominance and Wout didn't.
I'm not going to call WVA and MvdP "pretty even" I think MVDP is ahead there, but Wout's career is still blooming impressive, in a different way and doesn't include wins for his leaders where he has contributed massively.
WvA has also had the misfortune to suffer 3(?) career threatening crashes and comebacks.
Oh, and Pog is on another level.