I had the AZ vaccine and felt rough for a good couple of weeks, fluey initially then very fatigued, but nothing major. Very sore arm, but I always get that from flu. DH had AZ and was also flueys, headaches for a few days but then fine and no sore arm. DS had Pfizer and so far not a single side effect. He would happily have taken the AZ one though, if available, and we would have happily recommended it to him as, in his case, he having it to protect his parent, grandparent and, I guess, many of his teachers. He understood that and was fine with and prepared for a few days of feeling ill, if it happened. He just asked to time it so it didn't potentially interfere with a football match next week.