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My choice is Dungeon :smile49:
1. Huge variety of tactics
2. No useless heroes; any hero can be taken as the primary one (only Irbet stands out from the list, but even her/him, when playing against Inferno, can be taken as the primary).
3. Emphasis on magic (I agree this is a very debatable argument, it depends on the preferences of the specific player).
4. The army fights with quality, not quantity (units of levels 1, 2, 4, and 5 are the best in their class; levels 6 and 7 are among the top three (IMHO))
5. There are no inconvenient opponent races, only inconvenient players :D (although at first I considered Academics and Dwarves to be such :smile35: , but then I found the antidotes :smile13: