Control of borders
We could already "control our borders", but decided not to.
Result: Neither
We have always had the ability to limit "freedom of movement".
The only land boarder we have (in Ireland) is causing problems already.
Additional checks at airports, docks, etc will cause more queues (ref going on holiday).
Tim Waggott (head of the port of Dover) warns that a single dispute with the EU, or just everyday lengthy customs checks, could cause chaos importing/exporting goods.
If you disagree, or would like to add more details, please let me know.
You can suggest a reason for leaving the EU, or look at the other reasons.