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AltUpgrades are definitely a bold and powerful theme for Heroes, and it's a first in the game's history. But in practice, not everything turned out to be as smooth and well-thought-out as it could have been. Some alts tend to be practically useless, or excessively one-dimensional.
Here are some examples:
1. Archers are definitely the go-to choice in almost every game.
2. Hunters (level 1 for the Tower) are also a clear winner, especially at the start.
3. Fire Demons look absolutely pathetic compared to the higher-level ones.
4. When it comes to Demonesses and Succubi, the latter are preferred in 75% of cases.
5. Death Dancers die like flies compared to the epic nature of their alt.
6. Orcish Warriors are good, but not in every situation, so Warmongers definitely take the lead, as they are more durable.
7. Kshatriya Rakshasa clearly outperform Rajas. It's enough to focus their main attack on a weak target, and a powerful area-of-effect attack that decimates everything around them is practically guaranteed with minimal losses, believe me.
8. Thunderbirds are a very questionable alt. They are rarely chosen.
9. Vampire Princes are an absolute overpowered unit. The chance of stunning needs to be reduced by at least 1.5 times.
10. Astral Dragons are a clear choice compared to their old upgrade. Although Grief can be resisted or removed, you first need to be able to create the right conditions for that, and a -1 penalty to morale is, frankly, insignificant!
11. Swift Riders are simply terrible compared to the old version; I don't think I need to explain why.
The rest of the alts are more or less balanced and justified.