In your opinion, which faction is the strongest in Heroes 5? Let's discuss the advantages and disadvantages of each faction.

Well, Dwarves have always been and remain the strongest, especially with their enchantments. Fortress is currently the strongest in version 3.0, followed by Demons (Nimues). In general, Dwarves and Demons, as well as Warlocks, are equal in strength; some excel with runes, others with summoning troops. Then comes Necropolis, which is equal in strength to the Elves and Mages. Warlocks are also very strong (honestly, you could say they are the strongest, with their ability to overcome magical defenses). The Stronghold relies on its rage, but otherwise, it's somewhat weak in 3.0. Humans can be considered one of the weakest.