These are some simple questions I've posed to myself to determine In or Out. Perhaps they'll be useful for others.
Who do I want to run the UK?
A) British politicians (whether Lab or Con or whatever)
B) EU politicians (Merkel / Juncker / Tusk / Barroso)
What matters more to me?
A) GDP, economic issues, corporate profit
B) Sovereignty and democracy
Which worries me more?
A) Economic uncertainty and other EU countries exacting revenge post-Brexit via punitive trade deals
B) Massive immigration, the migrant crisis and Turkey's future to accession to the EU
What stirs me more?
A) The idealism of a Federal Europe, ever closer union and a continent without Borders where anyone can work or settle in any country
B) Sovereign nation states determining their own laws, customs and futures based on the will of their People
And, again in the light of Turkey's promised visa-free access in June plus future accession, which country would I prefer the UK to have a border with?
A) France
B) Syria
I said on another thread that the arguments over the economic effects of Brexit are so hotly contested by both sides that they cancel eachother out. The fact is even the experts don't know what the real effects would be. Therefore in order to make a decision I feel one has to focus on all the other issues in play. Simple heuristic questions like the above have helped me to crystallise my view.