EMCS first time, absolutely horrendous (for a start, there wasn't enough time for the anaesthetic before they started cutting). I woke up most nights for two years after the birth, shaking and crying as the aneasthetist's words replayed in my head.
Second time round (different hospital!) the ob was fantastic, gave me the choice. I asked her to make the decision for me, and she advised ELCS, as she thought that it was extremely likely that any attempted vaginal delivery was likely to end in EMCS anyway. She said that although it would be under very different circs, and at the earliest sign rather than the last, she felt that a) I would have the thought at the back of my mind throughout labour, which may hinder progress, and b) there was a real possibility that I'd lose the plot entirely (she didn't use those words!) if wheeled down to theatre, and that the risk to my mental health and the baby's well being was high.
I think she was absolutely right. The ELCS was a completely different experience and although I still get upset remembering DC1's birth (or rather the fear, the shouting, and the pain), having such a controlled experience the second time round stopped all the nightmares and helped me immensely. As it turned out, she was also totally right about the need
for intervention, the same circumstances arose but at least there was a plan for a CS which then went ahead at 38w.
You have to do what's right for you, but in my case in retrospect I feel that the ob's instinct that the fear of a repeat experience would slow down a natural labour/delivery and thus increase the chances of a repeat, was spot on, despite my willing it otherwise. Good luck!