Although seized upon by one side in the argument, the currency issue is in my view of less importance than how the country is run and what the society is like. To again take Iceland as a comparison, on anything from infant mortality, life expectancy, women's participation in management and government, equality within society, (un)employment, health service effectiveness and its value for money, to peacefulness and happiness ratings, the UK gets left in the dust.
Personally I would avoid the Pound because it has a poor record but I accept the argument that in the short to medium term it would make the transition somewhat easier and calm people to continue using it. Iceland, with a population of 320,000, has its own currency. If prevented by a vindictive UK from using the Pound then Scotland should do no worse than Iceland by creating its own currency (unless one assumes Scottish people to be less competent) and might just maybe begin to catch up with Iceland's and the other top-of-the-list countries' societal performance (i.e. well ahead of the UK). It does not matter at all what currency is used to achieve that, to suggest otherwise serves other motives than a desire for a good society.