Hey Silly,
My highest city is Welves (humans), so many troops are not even considered:
L. melee: Paladin or Vallorian and sometimes even Orc Strategist. I don't like the Orc Warrior because he takes to long to reach the L. melee and sometimes I lose 1 turn of damage. Additionally, L. melee can easily "run away" from my Orc Warriors, specially the Ancient Ors. So I prefer to use units with longer range.
L. ranged: Orc strategist and sometimes L. melee if the terrain is good and it's a mix of mages+LR
Mages: I use the barracks archers and dogs (the latter only if there aren't Heavy units around, very rare actually). I do sometimes use the dogs as suicide squad just to kill/severaly weaken a single mage squad.
H. melee: Priests or barracks archers (if there are LR enemies, I use archers), there are exceptions though. If I am patient and check the terrain, sometimes the enemy archers are too far from certain starting positions. So I put 1-2 mages there. They hit and debuff the archer (thankfully I am Human and the range is 5 instead of 3, poor elves) and my archers finish him/her off.
H. ranged: Mages or Paladins (when the enemy has LR, they tend to ignore my paladins and go after my LR or Mages, so I use paladins to counter H. ranged). I don't have frogs...I would use them too if I could.
Right now, my city doesn't have the Merc Camp as I find it a waste in my current situation and from my T. grounds I recruit dogs and orc strategists (my orc nests help me stay in the orc surplus).
Also, thanks for summing it all up, I will consider following your strategy at later chapters.
Oh, I have a questions. I have a Witch hut, stage 1 and 1 artifact, so stage 2 I guess. Is it worth placing a stage 2 witch hut just to slowly build up a "frog" stock?
Thanks and fun,
Almond