J&J, one and done. In any future scenario where the vaccinated have privilege over the non-vaccinated(as has been proposed with vaccine passports), then J&J is the better choice. 1.5 months to freedom vs 15 days. People can say out loud otherwise because it's not the right thing to say, but deep down J&J offers the best incentive for a non-vulnerable risk-group member. "Whichever one is available to you" is a platitude that assumes all our motivations for getting it are the same. You're doing it out of concern for X, I'm doing it because chances are I'll have to, etc.