I just go to the topics and see the most beloved unit of a certain level, and... it's always the same. Seriously: who will fight with armies that only have one level 4 (or 5, it doesn't matter) unit? Players have armies! Many types of troops, and each type performs its role!!! And how useful it is already determines, in this case, its strength! Personally, I don't even use only one type of troops at the beginning. As for the cavalry, they are very useful guys on lizards.