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How on earth do you get the balance? Do you prefer one more to the other? Which battles do you auto resolve?
A lot depends on the difficulty level you play at. With increasingly more difficult battlefield settings, you will take much more significant losses by auto-resolving, and find you lose battles when it looked like you should win. The same applies to managing your economy. At lower settings, you can have the AI manage your cities for you, and you can concentrate on the battles. At higher settings, you will want to take control of city development because you have reduced income and the AI won't always take the most optimal path to development. Personally, I only auto-resolve sieges where it's a done deal anyway, and fights with brigands where I don't want to bother.