Which level 4 monster is the best?

Minotaurs, Ogres, and Cruisers one-shot Vampires in one or two hits, and they won't have time to drain anything with their weak stats and damage.

Do you have any proof? We conduct fair tests, while you base your opinion on personal assumptions. In a battle of 8 vs. 8, Vampires lose to Cruisers; the Cruisers only killed one and that's it.