If you are a smoker or use a lighter on a daily basis, then a Zippo is the better lighter (and will also be more expensive). If you do not use a lighter often or want a lighter just for a bug-out bag, then a Bic is a better option. The reason is lighter fluid evaporates, and this is what a Zippo uses, so if you leave it in your survival gear, it’ll likely have no fuel when you need it. Bic uses butane, which will not evaporate, and will be good to use when you need it. Zippo does have a good option for people that want the style of a Zippo but don’t use it regularly, the z-plus torch is a butane insert for standard Zippos.