Especially for infrequent travelers. He suggests going with an awards credit card not tied to a particular airline. It's complicated, but explanation in article makes a lot of sense.
https://crankyflier.com/2019/04/29/an-infrequent-flier-should-never-be-loyal-to-an-airline/
https://crankyflier.com/2019/04/29/an-infrequent-flier-should-never-be-loyal-to-an-airline/