What makes a rose unique among flowers? Does that make the other flowers lesser or better?
What makes you unique among humans? Does that make the other humans lesser or better?
Aikido is unique (to me) because it is the one martial art that I was drawn to. That does not make other martial arts lesser or better. If it were like some other martial art it would be that other martial art. And that other martial art, flower, human, is unique because it is what it is. It is not trying to be something else.
Sometimes it is good to just accept something for what it is without needing to weigh and measure it against something else.
