This grammar point means 'apart from ~ there's nothing else', implying the Noun is the best or most suitable choice.
Long explanation:
The structure Nounをおいて他に〜ない is used to express the idea that there is no substitute for the Noun, no other choice, or that the Noun is the best or the only one to choose among various options. This form is often used in praising or making good comments about someone or something.