Best level 6 unit.

P.S.: by the way, are there comparative characteristics of creatures in Heroes 3 at all (I know there is a comparison for archers)?

What exactly do you mean by "comparative characteristics"? If you mean a table with parameters, then yes, it exists...
In short, there is such a wonderful reference book called FizMig, which contains a lot of interesting information; I advise you to download and read it carefully. It's very interesting and informative.
You can read about it in this topic: [DISCUSSION] - Reference book, manual in Russian for Heroes 3

Sincerely.