Which Hero from Heroes of Might and Magic III is the best?

a level 4 sniper versus a level 2 archer. Let's compare archmages under Orrin and snipers under someone without armor specialization.

Okay, Orrin's specialization works stronger than I thought. And still, if the town is a Castle, the choice isn't obvious. After all, you can create a lot of snipers from archers, unlike mages in a Tower.