Leave, because the EU is a steaming pile of crap, which is growing by the day.
If I'm not wrong, most of the same vomit was spewed out about Britain being outside for the single currency debate - we stayed out, the Euro is an abject failure, has caused misery for tens of millions in southern Europe - and no-one talks about whether Britain was right or wrong to be out of the Euro any more.
The thing I really, really don't get is that prior to last year - no-one I know really gave a hoot about the EU. Everyone was incredible meh about it, until it came to leaving, and then people got really concerned that suddenly it was a pivotal part of human existence.