How is it a different comparison? If you knew whether or not you'd need an emergency c-section, you'd never have any emergency c-sections. There are four types of labor:
1. Unassisted (with and without medication)
2. Assisted (vacuums, etc.)
3. Scheduled c-section
4. Emergency c-section
The problem with #4 is that it often happens after attempting 1 and/or 2 unsuccessfully. The baby is in a much worse position, sometimes medically and often physically within the mother's body. You can't compare 1 and 4 without also comparing 1 and 3, 3 and 4, etc. Everything is interrelated.
Comparing outcomes of emergency c-sections to scheduled c-sections is always going to come out in favour of scheduled c-sections. On one side something is going wrong 100% of the time and the other something is not always going wrong. Not sure how to make this anymore obvious. This is a pointless comparison.
Comparing outcomes of natural births as a whole vs scheduled c-sections is far more useful comparison.