As far as seating goes; I pick and choose from available options depending on When, Where & What. Without going to too much detail, my decisions are made weighing a combination of aspects: I prefer bulkheads/exits (it's amazing how far back some of those AA 757 "First Class" Seats recline); window for routes/airports not flown before (or little) - otherwise aisle, West Side for morning flights - East Side for Afternoon (keeps sun out of eyes and generally better views). I tried FEBO, OK if it matches but the viewing is more of a consideration. (Of course I've had a couple of flights where the "preferences" (FEBO) rule was not followed.)