This is what I use , PU cheap from rental abuse , ez refit & now looked after to make fine wood chip for pellet stove or farm mulch
Wood chips or saw dust make excellent mulches as it often takes years for them to break down into compost. I live on what was a working saw mill site when my father in law bought in 1976. The wife and I put in a trailer in 1980 and gradually rebuilt it into a house. We have one of our gardens on the site of an old sawdust and slab pile. It took about 20 years for the sawdust to completely break down, given it was at least 1 foot deep when first tilled in, and I still find some of the old pitch knots when I till.