Is the following attributes correct if nothing is researched and no gear or skills: Archer > Footman..

Roughly speaking yes I believe that is the case. However once you add in heroes, research, and other buffs this is irrelevant.

Archers have the best attack stats, Cavalry the best speed stats and Footmen the best defense / destruction stats. Depending on what you are trying to attack and on what skills and buffs you have unlocked you will need to try different set ups to see what works best for you.