General discussion about Heroes of Might and Magic II.

Hello, I have a question about creature upgrades in the second Heroes game. If possible (if there are enough resources), should I always upgrade them?
Or do some unupgraded creatures have unique abilities? (I read a thread about the 5th Heroes game, and archers don't have a penalty when shooting through walls, but crossbowmen do). Is there anything similar in the second game?

In the second Heroes game, upgraded creatures are stronger than unupgraded ones.
I don't know of any unique positive features.
I can give three arguments against upgrading, which are more exceptions than the rule.
1. Dwarves, orcs, ogres, pikemen, swordsmen, iron golems, and in PoL, riders (5th level of knightly troops).
If there are fort buildings on a hill (dwarves, ogres, orcs), a foundry (pikemen, swordsmen, iron golems), or a stable (riders) within reach, the corresponding troops are upgraded for free. I remind you that, unlike the third Heroes game, in the second game, if an upgrade building is available, you can only recruit upgraded troops!
2. Forming a "strike force" - an invincible squad of great strength. If we see a large number of unupgraded neutral creatures, it sometimes makes sense to add them to our own unupgraded creatures. I remind you that this is an exception, not the rule.
3. Too many squads. We have 5 squads that we need, and we see a sixth squad on the map that can be recruited, consisting of unupgraded creatures.

However, practically all of this is an exception!