As I'm sure you've probably worked out, there's no definitive, general answer to this question. For evidence, I'll simply point to the fact that, if there was, it would have been shouted from the rooftops by pro-Brexit campaigners.
However, it's possible to sketch out some of the likely consequences but you'll have to work out for yourself if you consider them net positive or not.
Firstly, assuming we don't remain in the customs union, we'll be able to negotiate bi-lateral trade deals. Short term, this is unlikely to have much effect. The reason being that there are a lot to complete so most are being negotiated on a like for like basis i.e. the same as our current EU ones. Just for stability.
In the medium term (and 5 years is probably there or thereabouts) we'd be expecting to close final version of some of the bigger ones e.g. US, EU, China, Switzerland. It's unlikely that the EU trade agreement will be net positive for the UK because they'll keep their usual red lines and we'll have our own, different, ones.
For the others, though, there are opportunities. For example, the EU tends to negotiate very complex agricultural tariffs. This is because of CAP and the general strength of the agricultural lobby in the EU. The downside is that the EU often has to give up some advantage in other areas to maintain this subsidy regime. For the UK, agriculture is substantially less significant, politically. So we may well end up agreeing trade deals that are net negative for our agriculture industry, compared to now, but beneficial to other industries e.g. manufacturing or services. If you're farming rape seed today this could be an issue. If you work in advertising (to pick a random occupation), it could be positive.
No deal has equivalent but different concerns. We'd be under WTO rules. However, the exact tariff regime we'd come up with hasn't been agreed (or at least publicised). Once the initial confusion has died down, there are likely to be winners and losers relative to existing tariffs. My educated guess is that agriculture and services will take a hit which manufacturing may well do better. But it's just a guess at this stage.
Secondly, assuming we don't stay in the single market, there'll be no freedom of movement with the EU. Now, it's highly debatable what level of immigration we'll have post-Brexit. In fact, it's economically questionable if it should be much lower than now. However, what is fairly indisputable is that freedom of movement makes immigration levels difficult to predict and, worse, dependent on circumstances outside of the UK's control. So, if you found your children in schools where there was a substantial increase in pupils, but without the equivalent timely investment, this is less likely to occur in future (whether the school investment will be at an appropriate level in future is a separate question).
Thirdly, the EU has strict rules on state subsidies. Outside of the EU, we are free to choose what we subsidise (ok, probably not completely free as we will likely be constrained by trade agreements but how we are constrained will be our choice). This is something that the current Labour leadership are very keen on as they would like to invest heavily in public ownership. So, if you consider, say, rail nationalisation a positive move then this sort of thing is much easier outside the EU.
And fourthly, don't discount independence considerations. There are plenty of people that do consider a united Ireland or independent Scotland a positive thing. For the former, where once the considerations were primarily religious, post-Brexit, there are likely to be very good economic arguments for uniting Ireland. Would it swing a vote sufficiently? Probably not given the depth of feeling but a major UK recession could affect that.
Similarly in Scotland, there's a much stronger case for a second referendum if Brexit happens than if it didn't. Moreover, the EU was dead against a break up of an EU country. They may well look very differently at a Scotland coming in from the cold, as it were. If Scotland also wanted to join the Euro (toxic during the first referendum, less so now), the EU may be very amenable. This could easily be enough to swing a vote.