IMO

Bus will get you seniority faster in F/S/D as seat locks expire and FOs bid to Z or MD, and its bottomfeeder schedules aren’t *quite* as bad as bottomfeeder domestic schedules.

757 has more overall options and is definitely the smart play if you want SDF but can’t get it on any fleet as a newhire.

One airplane/engine/avionics (for now) is better for us neanderthals, too