First of all, you should not sell your Bitcoin. But if you have to, then always sell your Bitcoin for cash. Cash is a safe and secure way of dealing with such situations. Take the cash and then buy whatever you want to.
It is my advise to people to not sell their Bitcoins. You should only sell your Bitcoin in time of need. The Bitcoin market can explode in the right direction. You will regret your decision if you sell it. In the very beginning of Bitcoin, somebody sold their Bitcoin for Pizzas. How do you think he feels right now?