I can only tell you that I got it when it was available to my age group. I took the Pfizer, but would have also taken the Moderna. The J&J vaccine is formulated to work much differently and has been shown to be less effective, so I decided to reject that if it was my only choice. Do I think I would survive a Covid19 infection? Its almost 100% likely, but there is no way to be sure. However, as a runner, I prefer* not to have potential lung scarring that could further reduce my 60yo lung capacity. It really is a personal health choice based on your own unique situation. *I say prefer because life is a contact sport and as the famous Gump once said: "you never know what you're going to get."