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In a Necropolis vs. Sylvan matchup, the situation is quite clear. Sylvan offers a faster-paced game, but if the game drags on, Necropolis builds a strong enough army that nothing can help. In my opinion, the key is to choose the right moment to attack.
I wouldn't say it's that straightforward. In a fast-paced game, a lot will depend on the neutral creatures; if you encounter the most "annoying" ones, you'll suffer troop losses and fall behind in development. Necropolis also has a good start, considering they have 1st-level archers, and you can use zombies to effectively counter archers, and if you kill anyone, you can raise them with magic. Regarding longer games, a few words. IMO, Necropolis isn't so much dangerous because of a large army, but rather because of the very unpleasant spells of Dark Magic (Charm, Berserk, Blind, and mass slowing, weakening, and poisoning spells, etc.).
Белый и Пушистый! Иногда.....