We have a fuel rod and I like that it can just live in my Disney bag - no need to remember to take it out at home, charge it, and put it back in - so I don’t have to worry about accidentally forgetting it or anything. It’s also tiny and lightweight.
It’s definitely not the strongest charger (it juices my iPhone 11 about 40% if I’m using it while it’s charging), but the convenience makes it worthwhile for me.