Here in France quite a lot of work has been done on BRF- bois raméal fragmenté- roughly translated as fresh small branch wood chippings. If you read French here is a good allround information site
http://www.brfgeneration.fr/ and of course wiki
https://fr.wikipedia.org/wiki/Bois_ram%C3%A9al_fragment%C3%A9
My experience has been very positive, with a few things to watch out for. My land is typical south of France garrigue, thin top soil on a calcium bedrock, very rich in minerals and totally lacking any vegetable humus. So the idea of BRF instantly appealed. It also helps that I have 50 acres of youngish green and white oak forest that I am slowly trying to whip into shape by cutting down the smaller trees and trimming the older ones.
As I work though the forest we chip up the fresh, and it has to be fresh branches, mainly anything under 5cms width, only the oak and chestnut as pine resine is a big no no. We primarily cut in Autumn and Winter because of the heat and fire risks of Spring and Summer. The woof chippings are then scattered on herb banks and garden as well as the vegetable patches up to a depth of 20cms. This is best done in Autumn, November is good. What we have found is that at the start of the process the chippings suck up nitrogen before they start to break down so a quiet period is essential to start the process.
After 5 years of doing this every Autumn we now have a good depth of rich soil, equally important for us is the water preservation qualities of a good mulch as well as the heat protection it offers the roots.
Happy gardening
Pete