Main and C+ seating on the A220 is 2-3 rather than 3-2
I prefer right-side windows to left-side windows (esp when traveling with Mrs767, who as a right-handed knitter would rather not worry about either her elbow or her work encroaching on either the aisle or a middle-seat passenger)
and — presumably like most others — I *greatly* prefer a 2-seat row to a 3-seat row