A gas lighter runs on liquid butane that you refill yourself. That is the whole difference from a disposable lighter: the device lasts for years and all you buy after that is gas.
Within that the choice varies. A soft flame is calm and economical, a jet flame burns under pressure and does not blow out. The size decides whether it fits in your trouser pocket or stays standing on the worktop.
Disposable lighters are cheap to buy and expensive to use: you buy a handful a year and throw all of them away. A refillable gas lighter is topped up in a few seconds, and a well-kept one lasts for years as long as you fill it with clean gas.
This category holds gas lighters from pocket size to table model, with one to four flames, singly and in value sets. All running on butane gas and nearly all refillable.
If you are looking for the gas itself rather than the lighter, that is under lighter gas. If you only want models you refill, have a look at the refillable lighters.
When comparing, look at the type of flame, the size of the gas tank, whether the flame is adjustable and whether it has a lock. If it will not light any more, the lighter is usually not the problem: that is in lighter not working any more.
If you are torn between a jet flame and a soft flame, let the place decide. Indoors with candles a soft flame wins because it does not blow the wick sideways, and outdoors or in a draught a jet flame is the only one that keeps going.