I was in the same situation and looked closely at all data. I chose the five and honestly had zero complications. I used Mepitel film and had no reaction to the skin at all. As far as fibrosis, there might be a little around the scar but I had a small 7MM tumor removed so not a lot was taken out. I had clear margins. My doctor explained all the studies and why she thought it had potential to do actually less damage to my heart and lungs. I did not have to do the breath holding at all since it was targeted radiation, even though on my left side. Clear scan 7 months later! Good luck with your decision. To me it actually felt like less harm going the shorter route, but I know everyone has different perspectives.