On one hand - hordes of skeletons, on the other hand a slant towards the Elder Dragon and water magic (and consequently, prayer, clone, and a clone of archers is a mega-thiiiiiing), on one hand hellish vampires, on the other hand powerful shooters - fanatics+archers, etc.
All else being equal, victory will probably go to the luckier player.
Of course, the Necropolis has such a mega thing as the Cloak of the Undead King, and if they assemble it soon after the start of the game, it will be unrealistically difficult to defeat them, but no matter how easy it is to assemble, it doesn't happen often and usually closer to the end of the game, when it no longer matters decisively.
P.S. By the way, the Necropolis has another nasty ability that drives me crazy :-)), those pests, they don't get blinded :-(. Also a plus in their favor, but again not a decisive one.