edge: something that gives you an advantage over others.

competitive | slight | decided+edge
have to gain a competitive edge over rival suppliers
The intensive training she had done gave her the edge over the other runners.

It seems the US is losing its immigrant edge, but it has maintained its military edge.

The new electric car will have an edge over its rivals.

Apple's products have an edge over its competitors.
Students with great concentration have a competitive edge over their absent-minded classmates.