For firewood we use already fallen branches. But we prefer to pollard rather than coppice if we are using unfallen wood.
White Mulberry pollards *really* well, and we get great
kindling size wood yearly, easily, from a well grown tree.
Fruitless white mulberry is actually better, we’ve found. There was a preexisting fruitless white mulberry here, and it grows faster and is more carefree than the fruited we’ve planted.
I don’t think I’d plant more fruitless trees, but it’s an interesting observation. And we really appreciate the carefree and giving nature of that fruitless tree.