The Keshik are stronger, but they are slower as well, so catching up to Ghazi raiders is not feasible for them.
In theory, Mongols are better in feudal age. They have access to the Keshik, which is better than the Ghazi Raider – it's stronger. But the mass is a problem. The free upgrades are a problem. And the healing from the scholars is an even bigger problem than all of the other factors.
Against light units, the Keshik does great work because of healing. Even against the Ghazi which have extra damage to heavy. The problem is if you overextend with them, the Ghazi speed and surround can be really scary. But in a well-controlled fight, the Keshik always comes out on top.
If you open with Mangudai to snipe villagers on the tree line, be aware that you are susceptible to Ghazi Raiders, which you should expect from Delhi.
Delhi's weak spot is its food. You can starve them right after about 10-12 minutes.
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