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My choice: mage-djinn-titan. When playing against a human, I almost always choose golems instead of mages.
With AI opponents, everything is clear – the best strategy against them always involves having more ranged, spellcasting, or generally long-range units. Although, for some factions, I enjoy playing with a purely melee army – Order is not one of them. Missing the opportunity to get 4 ranged units seems a bit foolish to me. Mages, with skillful leadership and protection, will never die (unless other mages poison them).
But playing against a human doesn't forgive mistakes or weak, fragile units. Mages will be killed on the first turn (even a brute can easily shoot them down with a bow, even if there are a hundred of them). The only point is to hope to cast poison on the enemy's strongest unit, but this is a rather strange bet – against many monsters, it's practically useless (Chaos Dragons, undead, elementals, the entire Life army). The enemy heroes will almost certainly have magic resistance (although not every tactic buffs this parameter; some just place them in the rear – well, then the mages will shine :)).
Besides, mages are quite slow on the adventure map. Therefore, even when playing against the AI and focusing on speed, I choose golems. High defense, excellent magic resistance, and movement range is completely irrelevant – in skilled hands, teleportation works wonders :D
Djinn – no comment needed. Naga's 90 HP and immunity to the most powerful spells are not worth it. And against Chaos Dragons, djinn are very effective! Chaos factions rarely have dispel (natural antimagic won't help them here) – I love casting illusion on titans (usually, it results in a HUGE horde, many times larger than the "native" titan squad). Then, the Black Dragons will have to choose – either attack the djinn (and get beaten by the titans) or attack the titans and get beaten by the djinn.
Regarding the fourth-level unit for Order, everything is crystal clear. Refusing the greatest ranged unit in the game in favor of a mechanical cockroach is usually a mistake. I only choose Dragon Golems when using an "antimagic" strategy – a bunch of golems, dwarves, dragons, heroes with magic resistance – tough luck, Chaos. But Nature, Life, or Might will easily crush such an "antimagic" army.
