I think that depends. I live on a rural farm property and have rented a wood chipper twice in the last year. Some trees, when felled, trimmed or whatever, can be cut for firewood (many of us still have at least one wood-burning stove or fireplace). But many others, which do have value as far as the property goes, are useless for chopping. I have numerous cedars that serve as boundary markers between different areas, and several other species of tree that are good for shade but their wood does not burn well. A chipper is very useful; you feed into it all the fallen branches, tree trimmings, storm-damaged limbs, dead wood that has fallen down, even odd bits of lumber or furniture you want to get rid of. It turns the whole lot into a mulch that can be used in flower beds, between rows in vegetable gardens, to fill in marshy spots, and so on. If you can't do your own chipping to get the mulch or wood chips you need, you have to buy them.
I don't have horses but neighbours who do are always looking for wood chips. I think they use them in the horse paddocks, not sure.