Tried most and for ease of use and long duration the peacocks win hands down. I have two of the the giant ones for each hand when its proper cold. Only down side is the smell of lighter fuel but it doesn’t bother me. Have had a total of 4 and no issues lighting any of them - easy peasy. I use zippo fuel as cheap in bulk online. I have friends who bought the zippo warmers and found them hard to light and keep running.
Have a couple of Hot Rox but its a pain remembering to charge them and on high heat they don't last long enough (peacocks will run 24hrs if you put enough fuel in).