Thank you for the clarification, I will slightly revise my build, taking resistance, but I still believe that summoning is more versatile, at least for single-player.
Illusions are good if you have a strong unit and always have the opportunity to strengthen your army with powerful clones, even if the opponent doesn't have units worth copying.
Hypnosis relies on resistance; if it's a battle against black dragons, for example, it will be useless without certain artifacts, and when you're playing solo, neutral creatures tend to combine into one stack, which also diminishes the effectiveness of hypnosis.
So, overall, I repeat – order is more useful, and if you have a good army, order can help strengthen it with clones and weaken the opponent by hypnotizing their main units, which will also strengthen your own army. However, for the chosen development path, where stealth is the focus, summoning is still the best option.