Having had both one c/sec and two vaginal births, I think it depends entirely on the births. Some people have quite traumatic vaginal births requiring surgery anyway or at least help down the track from repurcussions of said vaginal births, others have vaginal births with no complications. In that instance (vaginal-no complications) a c/sec is definitely harder in terms of recovery as you're coming home after major abdominal surgery and then have to tend to a newborn with all that entails. If you're breastfeeding, the best you can do is take Panadol for the pain and it's a hard slog.
For me, I hated every second of my 'textbook' elective c/sec for a breech baby. I definitely felt robbed, and I begrudge anyone who tells me I am wrong to have felt that way. Why wouldn't I, I ddin't get to experience labour, I didn't get to have those feel good endorphins that get released when you labour and have a baby exit through the birth canal, I was in pain, but moreso, I was mentally affected by it and didn't bond with my baby at all in the early days. It was my first baby and a harrowing time for me. So yes, my baby was very healthy, didn't need any neonatal care, had perfect apgars etc, but it still didn't take away my feelings of being 'robbed'. The c/s still has an impact, because my subsequent births have been vbacs and that too comes with it's own issues etc.
Anyway, I digress.
Even though I suffered a borderline 4th degree tear in one of my births and PPH in my last requiring surgery and blood transfusions, suffer prolapse which will need future surgery, I still think the C/s for me, was harder purely in terms mentally and ongoing. That said, I think c/s is far easier in a physical sense of course, in terms of the actual 'birth'.