Everyone has their own favorites. I like Blue Ribbon Cotton batting, but right now I'm using Hobbs wool, which is very nice - lots of puff. I get my smallest stitches with Mountain Mist Lite, which is a polyester batting. I've also used and liked Hobbs Polydown.
I didn't care for Warm and Natural, or Quilters Dream - I used the lightest weight, but there was no loft. Some folks like a flatter quilt, but I like to see some contrast.
Janet