What are the pros/cons of installing floors before doors?
I like to put the flooring in first. If you're working on the last row against a wall with a door in it, and you have to cut a piece that's half strip against the wall for half its length, and a full strip in the doorway, it's easier to get it into place if the jamb isn't in the way. It also means you can get the fit better at the  bottom of the door jambs, without needing to use a flush-cut saw to trim the jamb before you can fit a floorboard under it, or ending up with a gap between the jamb and the floorboards.

As far as cons, I guess putting the doors in first means less activity in the room once the floors are in place, and thus less risk for dropping a hammer and marring  the floor, or tracking dirt across the finished surface.