I had AZ, day of the jab nothing ever happened. Next day i hat side effects which persisted for roughly 4 days. Nothing too strong, my arm just felt like a horse had kicked it (and yes, i had that happen in my life as well), a splitting headache, tiredness and one night of fever. The headache was the side effect that lasted the longest, with nearly a week of headache. As i did not have to fly it really did not matter all that much. But for my second jab i will insist on the BioNTech/Pfizer one, which is backed by the advisement of the StIKo (german vaccine advisory board) for under 60 year olds.
But since i am based in EASAland there is no advise against either vaccine, the only advise is to not fly for 48 to 72 hours after the jab. Although my current company only allows for 24 hours of not flying.