na-adjective
General strength or power, used for people, things, or abstract qualities. Often used in compound words or as a modifier.
彼はストロングなリーダーシップを持っている。
He has strong leadership.
このチームはストロングな守備が特徴だ。
This team is characterized by its strong defense.
na-adjective
strong (taste); intense (flavor)
Specifically for strong taste, especially of coffee, alcohol, or other consumables.
このコーヒーはストロングで、苦味が強い。
This coffee is strong and has a bitter taste.