I do prefer to use the 2 gal pots like Fred does for the ones just staying over winter. The only reason I am using the 1 gal is because of space. I can fit more into the space I have than with the 2 gal. I'll have to try and remember to take a photo of them today and show you what I'm doing. Once we have all the other beds made I will go back to the 2 gal pots mainly.
One time I did try and plant some daylilies into regular decorative pots, not sure of size but the bigger ones, and the daylilies I had in them did not grow at all. I used miracle-gro potting mix (before I knew about pine bark) and they just wouldn't grow. When I put them in the ground they took off. I don't know what the problem was (I'm sure something I didn't do right)