Neuro or ortho for spine surgery, that is the question...?? From what I gather, in general, spine cases involving tumor of the spinal cord are done better done by neurosurgeons; other cases are better done by ortho. However, I think any ortho or neuro who has done a fellowship and specializes in spine would be equally qualified. This of course is debated. Programs have different methods of solving the question of 'who should do the spine cases?' Some alternate between departments, some go on a case-dependent basis, some even offer the residents short rotations in the other specialty.
The choice would be regarding your passion. Both ortho and neuro people are very passionate about their own separate fields of work. Other than spine, the rest of the everyday cases are completely different!! Ortho is very crafty and big-tool oriented.--Lots of physical labor and the patients usually live. Neuro is for those who absolutely love the brain, do more delicate work, and can handle the reality that most of the patients will not have the happiest outcome, (they certainly won't be inviting you to their future football games).
If you are truly interested in being a good spine surgeron, I would decide your residency based on the other cases that you would be doing for the rest of your life. Also, see which resident personality-type you are more like. Either residency would make you a good spine surgeon, but when you're on call would you rather operate on comatose patients or car/sports accidents?
Jova