While I usual like to throw my opinion about on every political matter, this is one of those situation where I am not sure what is best - simply because I see how both are good and bad, coupled with the fact that I didn't personally look into it myself extensively.
I know that for the remainder of the EU countries, it is not beneficial for the UK to leave, however we will see how it all pans out.
Nigel Farage is still an demagogue, and I can't stand him, but he does make some valid points.
What the EU needs is A LOT of reforms, A LOT and for that to happen, we would need the UK to aid in that happening, which is way it is paramount that they stay for it to work in the long run.