Really, these are episodes that are extremely forgettable. I'm going with Two Days and Two Nights as it seems to be the only one that I can even remember anything about, which is not much. Really I just remember that it is about Porthos having contracted something and having to spend the night in Phlox's swimming pool in sickbay.
Are you sure you remember "Two Days and Two Nights"? Because it sounds like you just described "A Night in Sickbay".
I am voting for "EXTINCTION" this round. Very little can be salvaged from ALL on this list, but I think the subtle worry of humanity going extinct like the Loque'eque and Archer's decision to keep the vial in storage echoes his fear that a similar fate may befall his own kind, which is kind of the undercurrent fear throughout the whole season. In that minimal way, it is keeping with the arc of the season.
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