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Heh. It was the alternative unit types that made me start playing Heroes 5 again. Although, it seems to me that the innovations aren't that significant for the Order faction.
Militia or Lendlords? No matter what, I don't take either – simple peasants pay for themselves faster (15 gold versus 30). Besides, I never used them as the core of my army or as cannon fodder.
Crossbowmen/Archers. I take Archers because they don't have a penalty when shooting. But if I happen to find a Unicorn Bow, I immediately switch to Crossbowmen.
Plate Armor/Zealots. 50/50. Either I split them, or I take two squads of Plate Armor. In my opinion, they are more useful in defense.
Royal Griffons/Battle Griffons. Yes. The main advantage of a Griffon is its jump ability. Plus, Royal Griffons have more initiative (15 versus 10).
Adept/Inquisitor. Either 50/50, or a large group of Adepts.
White Champions/Red Champions. White Champions are, in my opinion, overpowered. If there are two squads, they heal each other and run from flank to flank, breaking through the defenses (hackers, damn it).
P.S. Although, to be honest, I haven't really used Red Champions much.
Archangels/Seraphs. n/c. Resurrection is another cool feature of this faction.