The Khanate has light cavalry. All of their units except the level 1 recruits are mounted, and almost all of the units also have bows (the chances of having either a bow or some jarids are random, but it's pretty high even on lancers). Basically, you can crush most infantry based enemies, EXCEPT THE RODHOKS, who will tear your [cabbage] appart, because they are all heavy spearmen. Nords should be easy to fight, as for swadians, vaegirs and sarranids, you have to check how many horsemen and mamlukes/knights they have. Usually, a couple of them shouldn't be hard to kill, but when they have about 20 knights you can expect a lot of losses on your side. Also, the Khergit and the rodhoks are both the best at taking and defending castles, due to the good/huge ammount of archers. Myself, I play Khergit mostly because playing against them is a bother. They are the fastest riders, so even if you have a knight battles take long because it's hard to reach them.