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I liked the Knight's Castle ever since the first Heroes game; it has beautiful nature, mountains, fields, villages, and the weather there seems to be cool, moderate.
The Fairy has an advantage in its fairytale-like appearance, and the weather there seems to be very warm.
The Wizard's castle is beautiful on the outside, even very much so, but inside, only the forest and the river with the hobbit's burrow are beautiful, although the Wizard's tower and the orchard tree are also nice; the weather is probably hot.
For the Sorcerer, the mountains, waterfall, and griffin's nest are beautiful; it's gloomy, but beautiful, and it seems that the weather there is rather cold.
The Barbarians have a warlike, gloomy atmosphere, heat, their own established order, a lifeless desert, and harshness.
The Necromancers have a cold and gloomy atmosphere, but overall, it's quite nice, although no one seems to care about this abandoned land.