Terraniux
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In my opinion, the editor in Heroes of Might and Magic IV is the most convenient of all the games. Yes, Heroes of Might and Magic V and VI have more features. But in terms of comfort and the ability to instantly test the changes made, Heroes of Might and Magic IV is top-notch. I remember how I struggled testing a large map in Heroes of Might and Magic V. Brr...
In my opinion, the main problem with Heroes of Might and Magic IV is the AI. And it doesn't support HD format either.
Yes, the AI is also a problem. But, in my opinion, there aren't that many problems, and they aren't as fatal as some (most, but not all) critics of Heroes of Might and Magic IV like to say.
In general, the best game would be created by combining Heroes of Might and Magic III and Heroes of Might and Magic IV. To be more precise, by combining their good aspects. That's when you'd get something amazing!!