So after using each of the pillows, it seems that I hugely prefer the millet hull pillow and my spouse prefers the woolly bolas pillow.
Turns out the wool batting pillow is the only one neither of us preferred. Possibly because we stuffed it fully with all the batting we got. It was too firm. I will experiment with it further, by gradually removing some of the batting to see if it can get more comfortable.
The descriptions you have on your site are dead on. I love the millet hull because I can literally punch it and adjust the thickness as I roll around. What is awesome is that it holds its shape until the next punch.
My spouse loves the woolly bolas because it is very soft and cuddly even when fully stuffed with the quantity you provided. – G.R.