We won't consider tactics, because leveling up tactics for Order... isn't always convenient.
Even off the top of my head, I'm not sure in which situation a dragon is better than a titan.
I'm not saying to level up Tactics; you can just take the Core skill, and that will be enough... You can also equip the Shield of Order, and all your units will resist Chaos like Titans... And in general, I think the AI in the Fourth game is the dumbest and most flawed in the entire history of Heroes) It's only interesting to play against experienced players.
Added 3 minutes later
:)
P.S. I only play on the maximum difficulty level