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The Lord doesn't have such a big advantage, but Markel is essentially the best choice, especially for large maps; he can even defeat Haven (on a hero). Besides, you can upgrade the Death Herald, defense, luck, and inhabited mines, and he will become a protected, invulnerable, endlessly reproducing super-mutant that will crush everything without losses. And if you play without mods, fairly, then Orsik is still better than Lucretia and Vlad, because zombies are strong in themselves and will form an excellent company with archers if you upgrade Grave Chill, luck, battle madness, and light magic (if you're lucky); they will carry everything. The second option for large maps is Deidra, with her screams. It's not that difficult to collect at least half of the Vampire Robes if you search, and that's already a guarantee of victory + it's not that difficult to reach her, while the enemy will be running around with -5 luck and morale, so it's quite possible to defeat even the most trained knight.