woodshadows
King
It really boils down to the experience points/promotions. I'd rather have a keshik built with no promos than two camel archers built in a city with barracks/armory.
A small group of keshiks fielded as early as possible will have logistics before camel archers even have the third terrain bonus. Someone want to do the math (can't right now)?
You also make repeated mention of tight terrain being in favor of camel archers. If a camel archer gets caught in a tough spot and gets hit by two pikes because he can't retreat, he's toast.
The keshik will probably at least be able to retreat to be attacked by only one unit at worst.
I think being caught by a pike by either unit only occurs with improper scouting. Both units have the same visibility range, in which case if you place the keshik on a spot and can only see a couple of spaces in front of you and the camel archer does the same thing, both units/players will feel 'safe'. They see no enemy unit two spaces ahead and gain a false sense of security. If you have a horseman with sentry or whatever the promotion is called, or scouts or mobile units flanking the primary battle zone then in either event, camel archer or keshik, you should be able to easily avoid damage or losses. My only point is that you should be able to just as effectively avoid getting hit with a camel archer as with a keshik, if you are getting hit then it's due to bad scouting and in that case, keshik or camel archer, you will be getting hit and in that case really the camel archers higher base strength and cheaper replaceability will be more of an advantage to you.