Mixing the brands is a good idea IMO. The mRNA used is different, so they encode different parts of the virus that your cells can recognize, meaning your body will potentially recognize a wider variety of COVID strains.
The main thing to watch out for is that the effectiveness of these vaccines wears off after about 4 months, so you should get a booster more frequently than is recommended.
Mixing the brands is a good idea IMO. The mRNA used is different, so they encode different parts of the virus that your cells can recognize, meaning your body will potentially recognize a wider variety of COVID strains.
The main thing to watch out for is that the effectiveness of these vaccines wears off after about 4 months, so you should get a booster more frequently than is recommended.