delineateddelinquent, yes, we need to look at both sides, but often questions being asked simply cannot yet be answered. What currency? Last time we offered a currency union, where we would keep the £, but that was bizarrely and illogically refused. We could use it anyway of course, but would lack any control. We could use the € (without joining the EU), the $ (US, Aus, Canadian...), any tradeable currency, but again we would lack control. I favour a new currency, personally. But it's a matter to be decided in post-Yes negotiations and simply cannot be set in stone in advance.
It's the same with joining EU/EFTA. Assuming it happens soon, our laws etc are all fully EU-compliant and no-one has expressed horror at Scotland rejoining - all current noises are friendly and welcoming (yes, even from Spain, who like our seafoods). Under what conditions though? That would be subject to negotiation, probably not as good a deal as we currently enjoy, but the trading advantages would be enormous.
No-one has a crystal ball. But WM government predictions of massive losses to the economy all over the UK (6% in Scotland, 11% in NE England...) make independence very attractive to me. We may fuck it up, but it will be our own fuck up and we can hold our politicians to account. We can do nothing about Boris.