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Let's start in order.
Castle: Archers are weak, even the upgraded ones that attack twice. Fanatics are good; they deal decent damage, and it seems like they don't have any penalties in melee combat.
Rampart: Well, it's clear here: Grand Elves forever!
Tower: Goblins, if there are a lot of them and they use the "Accuracy" spell, they become powerful, but otherwise, they are weak. Archmages are beasts; no one can reach them before they attack :-). And there's no need to talk about Titans; they are archers of level 7 after all.
My favorite Inferno has a problem with archers. There's only one unit, and it's not very good.
Necropolis: Here, like with Grand Elves, everything is great.
Dungeon: Here, the archers are the most durable (all without melee combat penalties).
Stronghold: Cyclops are the best, although they could have been given attack rolls without penalties.
Swamp: Lizards are weak, both in terms of attack and HP.
Elemental: Storm Riders are strong, especially for level 2. They also deal decent damage. I'll say the same about Ice Elementals.
In short:
My top three are:
Titan, Lich, Grand Elf.