Lasers are painful and expensive vs. Saline removal is a lot less painful and affordable.
Laser tattoo removal cannot see/treat certain colors vs. Saline is effective on all colors.
Lasers can damage the skin vs. Saline is gentle on all skin types.
Lasers are dangerous around the eye area vs.  Saline is safe to use around the eye, even on eyeliner.
Lasers change the molecular structure of the skin which will make it more difficult to accept pigment or ink in the future vs. The saline method does not change the skin and will not interfere with future work.
The laser tattoo removal process can remove eyebrow hair permanently vs. Saline which will not cause any harm to your eyebrow hair.