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Q. What is the strongest unit?

A.
It depends on what you want from this strong unit. The paladin is the one unit which is definitelyis strong at everything but you can only have one of theese per player. So I would say the Heavy Calvalry is best at defence as it has a general defence of 200. The heavy calvalry is also best at Offensive strength with 150 but if i were you i would just train Light Calvalry as for a much lower cost you get only 20 less offensive strength.

For more info on troops click on these pages:
Infantry Units
Calvalry Units
Siege Units
Special Units (Paladins and Noblemen)