Depends on context but burring wood works just as well. I've done both but it's easier for me to build up the land then dig down because the contractors who bui

Depends on context but burring wood works just as well. I've done both but it's easier for me to build up the land then dig down because the contractors who built my house 20 year ago, ruined the natural forest and buried gravel and stone underground as fill ... I do dig swales on contour and fill with wood chips to make garden paths. I harvest stone at that time to build garden walls and depending how deep the path is before filling I toss in some old logs before covering with woodchips for walking. The end result is the walking paths become resavoirs for holding water and my feet stay dry and I'm left with topsoil to further raise up my garden beds and rocks to build with. Basically rearranging the material that already exist on site to build a self renewing system!