While I tend to agree that one of the disposable lighters such as Bic are probably better for a survival kit, Zippo lighters can function on many different fuels which makes them an asset over the long haul.

I have Bic lighters in various kits and keep long, flexible neck lighter in one specific kit. The lighter I keep around the house for candles is a long neck Scripto because it can reach down into a candle to light a wick that would be tough to light with a match or a Bic. Everything has its place and so I keep a near new and dry Zippo as a contingency. All I need to do is add fuel which should be easy to find.