This question already asks what about the importance of watching Farscape in the intended order, but unfortunately the only answer that offers an intended order recommends going by the production code, which I am skeptical about (see below).
So far, I have found four possible viewing orders and no straightforward answer:
By production code – So far I watched almost all of Season 1 in this order, and it made sense. Obviously, there is some natural order for the last third of the season (after Durka Returns), but the subtle character developments and details in the first two thirds also seemed to fit. What was a little bit bizarre is that some similarly themed episodes were directly succeeding each other without apparent reason. Most importantly, I spotted that the serial Look at the Princess would be torn apart and rearranged in this order, which makes me skeptical about continuing that order.
By UK airdate or by US airdate – Outside of Season 1, these differ only by one episode (My Three Crichtons). In Seasons 3 and 4, they only differ from the production-code order in one case (flipping Lava's a Many Splendored Thing and Promises). However, in Season 1, they put I, E.T. (the second episode by production-code order) rather late, which does not seem to fit the subtle character developments to me. There are also a lot of differences to the production-code order in season 2, which I cannot comment on.
By Henson.com – In Season 1, this is identical to the production-code order; in Season 2, it differs only be putting Look at the Princess II where one would expect it. In the other seasons it follows the production-code order. This order is my best guess so far, but only a guess.
So, my question is: Is any of the above the intended viewing order, and if not, what is? And as a bonus: Where should the bonus episode Union be placed?
I am primarily interested in Season 2 and onwards and have already seen most of Season 1, but I would prefer to have the answers free from unmarked spoilers for the sake of others.