Black Diamond
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Of course, the map size and other factors probably influence the choice of hero, but... I don't know... personally, I only play with a hero that isn't my "favorite" if I want to test out some new tactical ideas, but if the goal is to win, I prefer a tried and tested option.
Tried and tested))) maybe, but I, for example, wouldn't fight against mages with Necropolis, which means that in this case, my favorite hero is out of the question, because that castle is out of the question. So, you need to have preferences for each castle, or at least for three... but that's just my opinion.