I only really fly Delta and they don’t have any MAX aircraft, so that makes things easy. The majority of Delta flights I’ve been on are Airbus aircraft. I’ve only flown on one Boeing (737-800) in the past two years and that was from a non-hub Delta airport.
then you should be concerned that your airline of choice (delta) has already paid for and taken delivery of dozens of over 100 737 max's.
They made this purchase years after the initial 737 max issues, and ofc years of issues Post MD merger. They also are putting about 30 percent of the seats as premium/high cost seating. for some reason.
Delta and especially boeing do not have your safety at heart, they have the bottom line at heart and will put you in whatever is most cost effective.
