My understanding of the SNP is that they are repulsively Leftist (worse than the Labour Party if you can believe that).
I have been following this and the argument that the First Minister has been making is that independence is good for jobs (IOW not a freedom issue).
This is not a valid, rational reason for Independence.
However, I do think Independence might be good for Scotland.
I also live in a State where the urban population centers dictate what the State does and what the level of taxation is. I also am tired of not having a voice in our government. I do understand the desire for Scots to be independent.
Then, of course, there is the important decision regarding currency. Scotland could decide to stay on the pound, go on the euro, or start its own currency. Under the first two choices, Scotland would cede much of its newly gained independence to others, with great economic risks (see southern Europe). The third choice wouldn't be very different from the first two; Scotland is a small, open economy, so its exchange rate would be determined primarily by the balance of payments, changes in government debt, and relative money growth.