For ease the usb ones are hard to beat however my goto are modded zippo/peacock ones.
Once you understand how they work, they are brilliant….last winter we were getting up to 15hrs from a fill in both the zippos and a peacock. We stopped buying lighter fluid and started to buy Naphtha - much cheaper.
There is a whole sub culture for the petrol heaters - the key is the catalyst in the top. Popular belief is you light it - you don’t, you are actually starting a thermo reaction, if the catalyst actually lights it pretty much Ruins it
This thread does remind me I have two zippos upstairs to be modded and ready for the winter. A couple of litres of naphtha should see us through

