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My IMHO:
The balance wasn't preserved in *any* faction (new units are much stronger) except for two:
Haven and Stronghold.
Well, with Haven, everything is clear - you defend with white-clad units, you attack with red-clad units.
And Stronghold turned out to be balanced, maybe because it's a new faction. And even then, there's a slight advantage towards the second set of units (like the Paoka, Free Cyclops, etc.).