I personally would use Bitstamp for such a big sum, I don't feel localbitcoins would give me enough security. With Kraken I'm totally subjective. So I don't know what you should do, but if I needed to liquidate 10 coins at this price, I'd do it with Bitstamp.
I would also vote for Bitstamp as you will have to divide the total into lots of parts if you want to liquidate in Kraken. Localbitcoins is not that preferable because 10 BTC is a lot and you cant trust anyone in this matter.