Simple:
* The strongest person in the competition lifted the heaviest weight.
* The strongest argument for change was the potential for increased profits.
* Her strongest suit is her ability to connect with people.
Figurative:
* His strongest weapon was his wit.
* Her strongest belief was in the power of education.
* The strongest part of their relationship was their shared love of adventure.
Comparative:
* The strongest of the three candidates won the election.
* This is the strongest coffee I've ever tasted.
* The strongest argument against the proposal was its potential environmental impact.
Superlative:
* This is the strongest wind I've ever experienced.
* He was the strongest man in the village.
* The strongest hurricane on record made landfall last week.