Those all look like they only hold about one piece at a time, and only then if it’s pretty straight. Mine with two sets of tall vertical arms can be stacked with 150kg of randomly shaped logs/branches (rated load) and cut through the lot in a couple of minutes.
I’m going to try growing mushrooms on some of the sawdust, was considering making briquettes but doubt it’s worth the effort given how easy it is to get wood round these parts (fnarr). So last week we took 4 builders’ bags to the tip, which seems a waste.