On the rash assumption that RansA assumed most of us can afford to run only one aeroplane, the 'mission' is the deciding factor, surely?
For those of us who enjoy the flight as much as the destination, near or far, the choice of that one aeroplane is important: for us speed is not a particularly important factor. We take longer to get there but enjoy the trip/legs. Those of you who have other considerations apply different criteria.
I think, as evidenced in another thread, whom you fly with is an issue. I'm sure those who want or need to consider a non-flying spouse/family/friend on your trip abroad will justify things very differently from those of us whose primary pleasure is geared to self.
Vive la difference!