The Sultan has 5% squad size bonus that allows you to bring more power into battle. It also increases research speed by 10%. Its Hashishin unit has retaliation as a special skill. The King has a 5% boost for marches which favors a more active and offensive play style. They also have a construction speed and iron mining boost. Its Teutonic Knight unit is very powerful. The Tsar has a 10% boost to training speed. They also feature an extra champion experience point bonus. Its Boyar unit is also useful.