A lot depends on the look you want and also on how far apart your quilting lines will be.
I personally don't use Warm and Natural anymore, as it has a slightly stiff drape compared to other battings (probably because it is needle-punched through scrim). My current favorites are Mountain Mist 100% cotton Blue Ribbon batting (must be quilted not further than 2" apart, but gets softer with every washing over the years) and Hobbs 80/20 (a little puffier and quilting lines can be a little further apart). Both of these are good for machine quilting; batting doesn't slip and slide, and they are easy to handle. The Mountain Mist is a very traditional batting, popular with quilters for many decades.
Some people like the antique flat, "crinkled" look (my fave). Others prefer the more modern comforter look (puffy). Some people are cotton fanatics (me); others like polyester. A lot is personal choice and the specific look you want for a quilt.