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

Yes, if you play focusing on development, no one can compete with you (but who will let you:()
If you have, for example, 1000 archers, the Necropolis will have 10,000. And in general, use Berserk or Subjugation and enjoy life!!!:D

This is possible if you are playing against a human player. But against the AI, it's not certain that it will have those spells, and it's not certain that it won't lose those skeletons during the game. Moreover, 1000 archers can easily become 1000 Inquisitors. And that's a completely different story.