Which monster do you like the most in Heroes 5 at level 5?

Hydras are in the lead, but here I would say it's not an objective assessment; fans of Warlocks simply don't care about their opponents.

Hydras are good because of their HP, regeneration, their defense, and so on, but all of this can be used with the help of the ability - surprise attack. It teleports the unit, and the next turn comes faster. By sending them into the enemy's ranks, they will bite all the units.

in terms of cost and efficiency, Larvas are still better; I only played with Hydras in the campaign.

Maybe, but with Liches, does the turn rarely start because