War Elephant is DEFINITELY the coolest looking unit in THE ENTIRE GAME! Its Hp bonus is very, very nice too but it poses some problems when stacked with Pikemen since a 5 hp, veteran elephant will defend even when theres a 4 hp, veteran pikemen present.
Samurai are nice too. Unlike those pansie Musketmen, the Samurai will cut enemy cavalry down before they can escape!
However, gamingwise the knight of choice is still the Chinese Rider, closely followed by the Ansar Warrior.