Which level 4 monster is the best?

A primitive method:
6 guards in a hollow is one thing, and the fact that it grows to 2 is another.

I'm curious, where did you get this picture from (and what city is it)?

This picture is from the game, can't you recognize the city? It's just with the "neutral city" option (version 3.58f). And aren't there 6 guards? Sorry, I haven't encountered these dwellings in maps for a long time, I don't remember. Please forgive me. But my opinion hasn't changed at all. There's a clear example! What about wizards at level 5, IMHO! (I tried to prove it with this picture, whether it worked or not is up to you to decide.) In any case, thank you for pointing out my mistakes; we will try to eliminate them altogether.
P.S.: By the way, the growth rates there are quite natural, so the growth rate for wizards is 3.