Fortress versus Necropolis.

I think teaching units is generally a very bad idea, unless you're playing like Kasparov. I think it's better to replace Attack with Defense, because I usually play as Naadir and fight to the last. The ghosts that appear after corpses serve many purposes: firstly, they prevent the enemy from resurrecting; secondly, they remove retaliation and block archers; thirdly, they hinder the enemy's advance, and it's hard to get rid of them with ranged attacks. It's almost impossible to play against dwarves without summoning, i.e., you can't rely solely on Darkness. There's no room left to add Logistics. Instead of Defense, you can take Leadership if the map is large and if it appears early. In summoning, I prefer to take Fire Warriors. This gives you 2 additional strong stacks – elementals and a phoenix, and if you also have a Hive, that's even better, especially against dwarves. Upgrading units is a good thing, but which upgrades should you take: for example, Messengers or Banshees, which fighters, which zombies, or maybe take archers instead of warriors? There are still many questions left. For example, almost all Darkness spells are removed by the Exorcism rune, Domination with Berserk is healed by Antimagic, but Antimagic is in turn removed by Messengers. In addition, you can take Zoltan as a hero to block, but again, Zoltan cannot learn either Scouting or Mentoring, therefore, the question arises, which of the heroes is best suited, etc