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Self
You can't escape yourself (c) :)
In what quantities? 5 vs 5 - yes, but 50 vs 50, vampires are much stronger. Plus, don't forget that the movement range with creatures is 1.5 times greater. Less running means less fighting with pleasant neutrals, therefore
less leveling up with necromancy.
The only advantage is necromancy. There can be difficulties with it too. And the fact that vampires restore life, well, creatures poison with acid.
As for the movement range, I don't really care about it in offline mode. I can still manage everything ;)