I don't have a lot choose from, so this might be an easier decision for me (I'm still defining my "ultimate" daylily). My one keeper would be
Chosen Love (I still don't know how to do the clickable link thingy) (yes,
I know there's a tutorial- I'm too impatient to go look it up right now)
My experience with this plant has been very rewarding. It bloomed for over 5 weeks this year, with a lovely fragrance. The blooms were of good size in comparison to scape and foliage (a medium sized DL- five fans make a pretty clump). The sun-fade was still an attractive shade and it proved to be pollen fertile for me. From a distance it looked rather pink- close up it contains more lavender. To my eye anyhow...
I've enjoyed seeing/reading about everyone's ideas of "one and only"...