Which monster do you like the most in Heroes 5 at level 7?

Offtopic: snipers? Is this some kind of upgraded Elven Archers or what?

Oh, it's a long story. Initially, when alternative upgrades were released, they were called snipers, but in Tribes of the East, they were renamed AA. However, Nival translated them, and according to the AoH manual in the Russian version, they are called Forest Archers.

if you leave the cloud with archers, the lords can cast the spell again)) although, will they spend a turn on it, or is it better to shoot...

But it's not a given that the AAs won't be protected by some slow units, like Ents, and by the time they move, you could win a turn with Thunderbirds. And if the archers run away, you can kill them with a Djinn.