Another point on the 'which is cheapest' - Can you find the cheapest seat?
Many pax (irrespective of mode of transport) do not know where/how to find the cheapest seat. These are often only available for short periods of time, under the guise of a Sale to be bought before a certain time of day etc. Not to mention that the main vendor (the carrier or primary agent) may not be the ones selling these seats. If you cannot readily find that cheap ticket - it does not exist.
Now to sit back into my very comfortable German, ergonomically designed office chair ...