Fwiw, the May 2022 Projected Category list has 90 A220 Captains on it and only 67 First Officers. Looks like they will have to add at least 23 more FO’s to balance that out.
The 737 has 174 Captains on the list and only 124 F/O’s requiring an additional 50 to balance that out.
If your goal is to get to Seattle, I’d stick with either of those two planes.
Humboldt