For what it's worth, I had a natural birth and there were about two hours of intense pain and about ten to twenty minutes of very intense pain. I had a second degree tear that required stitching. I have no lasting after effects and was out and about with baby at three days post partum. I felt fine in myself pretty much straight away. Of the mums in my nct class, seven out of eight had vaginal births, none suffered lasting damage. There were two episiotomies and a tear (me, I refused episiotomy). A friend of mine had a ten pound baby and didn't tear- best position to avoid it is on all fours as she did but I couldn't get comfortable in that position. Tearing can't always be avoided but you can minimise it.
Giving birth naturally is a tough thing for your body to go through, but if you prepare for it properly (I didn't, BTW, but made an attempt) it makes it a whole lot easier. There's physical and mental preparation you can do that helps enormously. Things may still go wrong of course, but they can with c section too (your chance of dying during c section is higher than dying from giving birth naturally, though still very rare).
There is some research on the benefits of vaginal birth for the baby that suggests going through the birth canal and being coated with bacteria as part of the process kicks starts the baby's immune system and reduces the chance of asthma and eczema. It also squeezes the amniotic fluid out of baby's lungs, helping them breathe more easily.
www.scienceandsensibility.org/blog/unintended-consequences-cesarean-section,-the-gut-microbiota,-and-child-health
I'm going for the same type of birth next time, unless there are risk factors that make that more dangerous.
Good luck whatever you choose, OP.