CO does not fly its own metal to SCL, so is the CO reward on Copa metal? If so, it will be domestic first seating on 73G's the whole trip.

DL's BE product has improved greatly with the latest "refresh." The food is now almost as good as CO's BF food, the wines served are much better than the swill that CO serves, and the flight will have AVOD (but I think there are a handful of 763's that have not yet had the refresh). Everyone always complains that about the seats being only 18.5" wide, but they actually feel wider than one would assume, IME. In addition, DL's dedicated BE lounges are comfortable and serve real food, good wine, and top shelf liquor.

Go with DL, obviously.