Apparently Vertos only does one procedure. So go Nuvasive:
The lumbar spine (lower back) provides a foundation to carry the weight of the upper body. It also houses the nerves that control the lower body. With aging, degenerative changes in the spine can occur. The disks between the vertebrae (bones) may become dehydrated, and the joints may become overgrown due to arthritis. Over time, these changes can also lead to narrowing, or stenosis, of the spinal canal.
The wear-and-tear effects of aging can lead to narrowing of the spinal canal, a condition known as spinal stenosis.
Narrowing of the lumbar spinal canal pinches the nerves that go to the skin and muscles of the legs. Sometimes, the pinched nerves become inflamed, causing pain in the buttocks and/or legs.
Degenerative changes in the lower back also can diminish the ability of the spine to carry the load of the upper body. This can lead to forward slippage of one vertebra on another, a painful condition called spondylolisthesis.
Lumbar spinal stenosis usually affects middle-aged and older adults. People who are born with narrower spinal canals are more likely to develop this problem.