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For me, it's all about the specializations and skills (and without a hit parade – they belong to different races).
Swamp - Bron (basilisks are great at the start!)
Castle - Sir Mullich (+2 speed – cool, but not given at the beginning), Adela (banned in the multiplayer – diplomat), and Caitlin (+350 gold, intelligence).
Barbarian - Jabarakas (orcs) and Dessa (logistics).
Necropolis - Isra, definitely (necromancy + Magic Arrow in the spellbook).
Elves - Ivor (elves) and Elassar (intelligence).
Inferno - if you're unlucky with the random selection, then Fiona (dogs right away, and she has a nicer face), but in general, Inferno is a mess!
Magic - Kira (banned in the multiplayer – diplomat) and Aine (literacy + 350 gold). I really hate Piguegram – his specialization in harpies, in my opinion, is on par with specializations in zombies, mysticism, eagle eye, and navigation on a map without water, and Sylvie – you can tell by her face – she's a DUMMY!
Dungeon - Alamar and Zheddit (resurrection forever).
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In Conflux, everything is too overpowered!
PS
Katrine, I didn't quite understand – is Aine the one I have, or someone else?