I was the same and went Moderna, not sure if it is proven but some suggestion it might be marginally more effective
Read an article from the US that indicates from lab tests that the Pfizer booster shows a 25x increase in antibodies vs 37x reported by Moderna. Moderna has also found that a double dose 100 microgram gave a 83x increase in antibodies (not an approved amount). Importantly though, is that both Pfizer and Moderna boosters
appear to be effective against Omicron - these are only lab tests after all. This is not medical advice, just quoting what I've read, YMMV, DYOR, talk to your doctor if unsure etc..
Both Moderna and Pfizer have released early data showing the effectiveness of their vaccines and booster doses as the new omicron variant begins to take hold and as COVID cases rise across the U.S. But is one performing better than the other?
www.nbcchicago.com
Had my Mo de RNA last week after double AZ, similar response as
@moorey and
@Dales Cannon Slightly sore arm, no headache but a little lethargic and mild joint ache about 24hrs later, then woke up fine the following day.