I really like daylilies that pretty much open flat, where the petals don't curl down. I love to be able to see petals clear to the tips, rather than having them disappear into a curl. And I love the toothy ones, and now there are some toothies that even have teeth on the sepals -- cool!
And I would love to see clearer, truer colors. Even the whites are really not white, unless they fade to white in the afternoon. When I got into daylilies a couple of years ago I really believed the pictures I was seeing, and now after that great learning experience I realize the colors in so many of the hybridizers' pictures have been enhanced/altered so I really can't go by just a hybridizer's picture for selecting daylilies -- although with a new introduction you pretty much have to, unless you can use the parentage as somewhat of a guide. And also, whether the flower is in shade or sunlight really affects the colors in bloom pictures. So I'm starting to take pictures both in shade and sunlight, and to look for both shade and sunlight pictures in the databases to give me more of a feel for bloom colors.