The trouble at the moment is that both sides of the argument have suddenly descended into scare tactics rather than providing actual, relevant arguments on it all.
I can see a variety of pros and cons to both sides of the discussion, but emotionally I am sliding towards the Brexit side of things. Over the last decade (at least to a fair few Brits), the EU seems to have been getting into a much more impenetrable morass of bureaucracy we have no say in, that isn't transparent, that sucks away money on an ever increasing red-tape and in-crony establishment, and crowds new legislation on us for no particular reason.