well, just by their stats alone you get very different fighting styles. Solomon Grundy is slow but very powerful. He has very limited range, but his moves deal a lot of damage when they hit.
While Black Adam fights very fast and uses a combination of long and short range attacks, hitting the enemy over and over again and not giving them a moment to counter.
But that's nothing compared to Green Arrow who is even worse than Black Adam, though Black Adam tends to fight using timed attacks and surrounding the enemy with storm clouds while Green Arrow just shoots arrows.
Basically every fighter has different stats and uses their respective abilties in relation to their stats to create different fighting styles