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1. I usually choose Imps because the hero needs mana, and Caverns aren't always effective enough.
2. I only use Horned Beasts at the beginning of the game, and later I try to replace them with something more useful. But if I do use them, I prefer the stronger ones.
3. For Fire Elementals, I use the Hound. An attack with three heads on two squares is powerful, regardless of speed.
4. Strangely enough, I use the Demoness. Chain attack is very good, in my opinion.
5. For Hellhounds, I see the effect, not just some numbers like -1 to morale. Attacking with fear is rarely needed, although it can happen.
6. I only take Caverns for Sorceresses. Support for archers and the hero is definitely needed, and there are plenty of other strong units.
7. Archdevils. Although I want to change my tactics here. The thing is, in my "licensed" version, the Archdemons had "slightly different" abilities, but only in the description, thank you, Urgash.