I am always a fan of the posterior approaches as they are less invasive. It really comes down to the skill of the surgeon. A bad posterior approach is not as good as a great anterior approach but all things being equal, I would want a posterior approach for my back.
Donald Corenman, MD, DC is a highly-regarded spine surgeon, considered an expert in the area of neck and back pain. Trained as both a Medical Doctor and Doctor of Chiropractic, Dr. Corenman earned academic appointments as Clinical Assistant Professor and Assistant Professor of Orthopaedic Surgery at the University of Colorado Health Sciences Center, and his research on spine surgery and rehabilitation has resulted in the publication of multiple peer-reviewed articles and two books.