First Covid-19 shot

Here is an Interesting article I saw about one dose of the different shots

How effective is a single vaccine dose against Covid-19?

my brother ,26, got his several weeks ago. He had a sore arm. No idea which shot
I got mine 9 days ago.44, Moderna. Arm was more sore than a regular flu shot for a day. My elbows and knees hurt/real sore all the next day then normal