It is difficult to answer your question, first because every trauma is unique, and second because my therapist does not use emdr very much anymore. As your ptsd stems from a monotraumatic event, as you have not mentioned childhood trauma, you will need much less therapy in any case, as those of us here, including myself with childhood/complex trauma. Symptoms for both are the same, but you should be through much quicker. I know that both Peter Levine and my own therapist, who trained with Levine, both have a very high success rate with mono traumatic events and somatic experiencing, and sometimes with not too many sessions; depending again on the severity. Somatic experiencing goes to the bottom of your incompleted physical responses like fight/flight that you inhibit during trauma. To me the method is as solid as a rock, as it deals with the deeper cause and not the symptoms. CBT is not my thing, because it seems symptom focused, and cognitive thinking focused. It does not get to the root of the problem, but I never had CBT, so you know better than me if this is true or not.