A neighbor of mine has a tree shear, seems like it always leaves a very short stump to trip over while doing fence repair. I use the Monster Tree Saw. It cuts absolutely flush to the ground and with it's long blade, I can reach under fences and cut some trees that are on the other side of the fence from my machine. Also, when cutting, I cut partly through the tree then push the tree in the direction away from the fence, then come back and finish cutting the stump completely flat and smooth. You may want to check out monstertreesaw.com