Camels r far more suited for desert than horses. The camels can go further and much faster than the horses. The horses are far more suited to Europe. I propose that there be 2 seperate units, based on where you are building ur army and on tech level, 2 different brances of weapobn development, after all European have to learn how to handle camels,a nd mulsims should start with the ability to control camels. Maybe, there should be a bonus for camels fighting in ME and Nort Africa or another arid & desert while horses get the bonus in Europe.