Well, the question of Scotland's national anthem is a thistly question.

There's no official anthem. Scotland was a member of the of UK before national anthems were a thing. The Scottish Parliament has the right to make a national anthem official but has not done so, considering it to be not a political priority.

Flower of Scotland is used by the main popular sporting bodies, rugby, soccer and atheletics.

https://en.wikipedia.org/wiki/National_anthem_of_Scotland

I myself dislike Flower of Scotland, both musically and lyrically and the other candidates are not much better.