I don't own many yellow self daylilies but of the ones I have my favorite is Siloam Mama.
I look forward to seeing her bloom every year. Each flower is perfect and beautiful. The scapes aren't tall but the flowers are held above the foliage. SM isn't particularly pod fertile for me. I haven't really tried it as a pollen donor.
I can't really explain it except to say that I consider Siloam Mama out of all the daylilies I own to be perfect. I wouldn't change a thing.