Lumbar fusion: debating best surgical approach

After 4 cervical fusions, I have high standards for selecting surgeons & surgical approach. But I'm perplexed presently. I am 48, eds3. I need L4-S1 fusion with pars defect repair. My renowned neurosurgeon will do a straight posterior fusion, and leave the discs "alone".

However, a second opinion by an orthopedic surgeon has me wondering. He considers my "global posture", and will help address my spondylolithesis by an anterior approach to support the discs, then an adjusted posterior fusion which will take into account the ideal curvature of my spine. I feel this is important, as my cervical fusion is from C4-T2, and I'm really struggling with joint problems at C3&C2.

But he's an "orthopedic surgeon".

Any thoughts?