Alex HallToday, I got the Moderna COVID vaccine in my right arm, and this year's flu vaccine in my left. I'll be curious to find out which arm hurts more in the coming days. And yes, doubling them up like this drastically improves the 5G signal my brain can receive. Would recommend. My government-issued nanotrackers have never had better ping times.
Superdave!@alexhall I got the COVID booster in the right delt, two days ago, and the injection site is still tender. I felt almost nothing as the shot went in. I got the flu shot about two weeks ago. It really hurt going in, but not so bad after.
Kday@alexhall I did the same and it was the flu shot as usual that made my arm sore for days.
LizI had them both at the same time last month, and neither arm was even remotely sore afterwards.
James 
@alexhall I did exactly the same thing, except I got Pfizer. They hurt equally.