I am going to go Pogi here. He can potentially win all the big classics and only in PR and maybe MSR does MVP have the edge on him, if you are looking over longer period of time.
Of course there is a team discussion here as well. One can argue the MVP is better suited to win MSR because Pogi needs some insanely high quality helpers to put the pressure on to make the race hard enough for him to be able to drop or tire MVP.
But that is also a very good argument for Pogi being the better classics rider: If the race gets hard enough Pogi will win.
Meanwhile races like Fleche, Lombardia and LBL are out of reach for MVP, probably Amstel and San Sebastian too these days.
It is clear to me if MVP finishes his career with a better Classics win list, it's because Pogi also moonlights as a very good stage racer.
But they are both absolute beasts in the classics.