Minerva
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I'm not an expert in Heroes 4, but I'll share my opinion. I think Sylvan is the strongest faction because:
1. I like the idea of the Hero participating in the battle. It's great to have an extra ranged unit or druid in the squad.
2. The ability to summon additional monsters from the portal.
3. The highest-level monster (Magic Dragon) deals lightning damage, which is satisfying.
4. Elves, as always, are great, and wolves are good too.
Minus: The monsters have few hit points.
However, playing as Sylvan, I haven't lost a single game, unlike with other factions. Although, it's just my experience, I've only mastered the Sylvan castle.
С того момента, когда человек начинает задумываться о смысле жизни, его уже можно считать больным. (З. Фрейд)