Two batts have not been mentioned much. Bamboo and Wool. We like both at the store and we have 80/20 also, but the bamboo and wool is what we like best. Bamboo is nice because it has antimicrobial properties and it's absorbent. In order to turn bamboo into a fiber, it is soaked in hydrogen peroxide which gives it the antimicrobial properties. The antimicrobial properties don't last forever, but it helps in places like baby quilts and nursing homes. Not so good for hand quilting cause it's a little hard to needle by hand. Bamboo is used in underwear cause it is absorbent.
Wool is my most favorite cause I like fluffyness which means that you can see the patterns in the quilting. In addition it really breathes, so it's just enough in the summer and nice and comfy in the winter. Wool batts are not scratchy. You will never guess that it is wool when you run it against your hand. Easy to quilt with. I love it.
Scrim. Don't use something with scrim. Scrim holds layers of the batting fiber together, but it causes the edges of your quilts to wave, so they never lay flat.
As far as W & N. Wool and Bamboo beat it every time.