I think the outies have the advantage that emotionally, no-one likes being told what to do; no-one likes being told that the rules are being made my someone else and they are powerless to do anything about it; and no-one like bureaucrats, red tape and stupid nonsense rules.
So emotionally, there's lots of reasons to leave. Your heart says leave.
But taking emotion out of it, and thinking about it objectively, it's a completely different decision (and one where my mind is genuinely not made up). On the one hand you have the fact the EU is an inward facing, bureaucratic nightmare, strangled with needless red tape, regulation, inefficiency. And with member states teetering on the brink of bankruptcy - states like Italy, Spain and even France - which if they were to topple over, would take the whole of the EU with them since there isn't enough liquidity available to keep them afloat.
Then on the other hand you have the prospect of leaving and at a stroke, putting > 50% of our entire exports at grave risk. I hear people say "but the EU exports more to us than they do to them". Well that's a fucking idiotic argument and a sham. Why? Because,
1. Our imports are from 27 member states, who in principle only stand to lose 1/27th where we stand to lose the whole bloody thing. WIth no trade agreement in place, our economy tanks for the foreseeable future. We are talking 10 years of recession. If we have no trade agreement, do you think Latvia caress as much about their loss of exports to the UK? No, of course they don't.
2. The largest proportion of our imports (the EU's exports) are from Germany who could perhaps be persuaded into a free-trade agreement with us, since they have a lot to lose. But what about the other 26 states? A tariff-free trade agreement would need the support of all 27 member states, including some who export fuck all to us, and wouldn't give a shit if they slapped a +20% import duty on UK goods. in fact they'd welcome it, they'd be happy to give us the two finger salute for walking out on them. They'd also lap up the prospect of protecting their domestic market from unfair "cheap" competion from the UK.
Seriously, does anyone REALLY think the French would allow us unfettered access to their market without strings attached? The French? Really? Not a fucking prayer. They would block it as sure as eggs is eggs. Other states would block it because if they didn't, they'd be worried that other countries might "do a UK" and also leave. In short there is no reason to believe a favourable trade agreement could be negotiated any time soon, if ever.
The very likely outcome is that in order to secure agreement, we'd have to sign up to a load of shite such as the working time directive, the supremecy of the european court of human rights and other such garbage that we are so keen to get away from. And we'd have export duties and restrictions and we'd have no voting power regards any of the shite we are forced to sign up to.
So our options are stay in, and be tied to a generally corrupt, underperforming, ragbag collection of near bankrupt states. Or to leave and in all certainly ruin our economy for the next 10 years.
Some choice eh.