There are many sensible arguments to be made for and against Scottish independence.
It is depressing that so much time has been spent on a non-argument: Scottish membership in the European Union.
If Scotland were to become independent, the rUK would still be a EU nation, and Scotland would have to apply for EU membership, UN recognition, and would have to ratify the various international charters, treaties, and laws. None of this would be automatic, but none of this would be difficult to accomplish.
From the conclusions of the Presidency, Copenhagen 21-22 June 1993 – the Copenhagen criteria:
The European Council today agreed that the associated countries in Central and Eastern Europe that so desire shall become members of the European Union. Accession will take place as soon as an associated country is able to assume the obligations of membership by satisfying the economic and political conditions required.