The phrase "a decisive superiority" is correct and usable in written English.
It can be used to describe a clear and significant advantage in a particular context, such as competition or performance.
Example: "The team's strategic planning led to a decisive superiority over their rivals in the championship."
Alternatives: "a clear advantage" or "an overwhelming superiority."
While NATO planners considered their own forces to be technologically superior to the Soviet forces, they were nevertheless mindful that the Soviet Union had a decisive quantitative superiority in conventional forces (more tanks, armoured vehicles, artillery, combat aircraft, and troops).
Shahade lost the least amount of material, but after 27 Qe5 Benjamin enjoyed a decisive one-pawn superiority.
Neither power was really strong enough to impose a definitive solution, nor were outside forces available to give either side a decisive margin of superiority in the way that Persia had allowed Sparta to prevail in the Peloponnesian War.
She made a decisive decision.
Numerical superiority was not a decisive factor for the Greeks during the final assault.
Haus hoped that torpedo boats and mines could be used to reduce the numerical superiority of the Italian fleet before a decisive battle could be fought.
This "generation of superior combat power at a particular time and place" enables a smaller force "to achieve decisive local superiority," providing an advantage when and where it matters most.
The Greeks, now that they had shown their superiority so brilliantly in a kind of dress rehearsal, were encouraged to hope for a decisive victory; and after this encounter they moved their camp from the foothills to a place which was better suited to a complete victory.
Vettel's superiority seems to confirm the impression left by his dominant victory in Japan a week ago that his Red Bull team have made a decisive step forward with their car.
"They want a decisive leader".
