I'm with you on their bias.
I don't actually think that there is a mainstream media outlet that has an editorial based on independence.
The National is just the Herald with a twist on its stories to stir bitterness and grievance amongst its readers. It seldom shines a light on the positives that independence could bring. Instead it prefers to let the reader know how incompetent WM government is (we know!).
The BBC is most certainly a lost cause.
It's usually better to find an article from a foreign newspaper about Scotland. They tend to be far more honest and balanced