When all things are equal and two aircraft are equal contenders for that number one slot, be it number one to land, number one for the optimum flight level, who goes into the hold and who gets the straight-in, who gets slowed, who gets sped up there is only one consideration to be made. Who upgrades me when I fly with them. Leading contenders by a country mile are an airline with a "Boris" lookalike as head and an airline from the Persian Gulf that has a fleet of rather nice, large aircraft. Co-incidentally, both airlines make profits. Coincidence?