I like to imagine my two main leads, a teenage boy and a teenage girl, as aspiring swordsmen who are equals despite tending to fight differently. The boy tends to be the more aggressive or offensive one (at least generally being the one to initiate the exchange). The girl, on the other hand, is tends to be less aggressive and relies on defense and counters, usually waiting for the other to make a move before striking. Basically, it's kind of like the tiger and dragon idiom or a yin yang.
Mind you, this isn't to say the swordsmen lack the other's capabilities, techniques, and tactics. The boy can still defend and counter while the girl is not above initiating exchanges or being offensive. The key thing is "tend to" not "rely on".
However, that's just what I imagine for writing swordsmen who fight either offensively or defensively. I am curious as to how you would write these fighting styles.
P.S. don't worry about my young characters killing each other. They're friends who spar with non-lethal gear. They only use their real swords on bad guys.