It seems that we are really talking about forceps/ventouse vs EMCS because they are the unplanned events.
I had forceps, I wasn't given any choice or of saying no even, although there certainly would have been time to tell me the pros and cons of each option. I honestly don't know what choice I would have made but as it happens my recovery from forceps was straightforward.
I don't know how much information you should be given before hand either - a balance needs to be struck between saying that things may go wrong, but normally they don't. I can remember at the ante-natal classes thinking that they were rather dwelling on what could go wrong and not much about how to make it go right - like staying upright, like making sure you don't go and tire yourself out in early labour.....
In my case, I have always felt that the acceleration I was subjected to was unnecessary, and was protocol driven, rather than driven by my health or the baby's health, which led to further intervention needing the forceps. This is where I would like to see more information presented. How many women really need induction/acceleration, which once they have it seems so often to end up in intervention? I don't know the answer, but I sigh when I hear yet another person say that they had to be induced, which led to EMCS/ventouse/forceps, and I wonder if they would have had a perfectly straightforward delivery if they had been left alone and the baby had been left to come in its own time.?