My advice would be don’t be consumed by what’s offered in new hire class. You’re only a good vacancy bid away from getting the plane you want (no necessarily in the base you want). Give yourself more choices by giving yourself the opportunity to bid up, can’t bid down without seat lock. . So 738, a320 are good choice in BI. Doubt they will offer more than 1-2 wide body slots per class.
For some commuters base might not necessarily matter 🤷🏻♂️