Stop in for a cup of coffee

My sons girlfriend in South Africa got the Moderna, she's young and it knocked her for a loop. No choice on what type she gets over there either.
I heard somewhere that the Moderna and Pfizer supposedly had similar numbers on reactions. Yet I haven't heard first hand of anyone having a bad one to Pfizer and many for Moderna. Wifes older sis in Florida had Moderna and felt like she had the flu next day.