Like the response above mine, I stuck with Pfizer/BNT, and it stuck it to me a little more than the first two. Fever and fatigue resolved within 24-30hrs, but were definitely more pronounced (Caucasian male, 40, BMI ~28 and otherwise healthy). My father had similar complaints.
My wife (similar age and health profile) had all 3 doses Moderna (booster dose, not full #3). She had a more pronounced dose two and no side effects from her booster. My mother is a walking comorbidity and had pronounced side effects from her Moderna booster, but was a trooper recognizing that a day of discomfort was better for her than the potential misery of COVID.
Side note - my 13yo will be boosted on Saturday afternoon.