These are my humble opinions on the most available mags I have sampled.
Quilter's Newsletter (as the title suggests) has a focus on what's happening in the quilt world rather than patterns - more stories of individuals and groups.
Quiltmaker hits the middle of skills for many patterns in various techniques(as the name implies).
Love of Quilting, American Patchwork and Quilting, Quilter's World, try to include a little of everything.
American Quilter (from American Quilt Society) has an educational edge to it with detailed technique descriptions and in depth interviews with well known quilters, also provides winning quilts at the major shows the attention they have earned.
Easy Quilts, Quick Quilts, etc, are more focused on what their name implies.
Quilter's Home was the brainchild and reflected the personality of Mark Lipinski, don't know what will emerge now that Mark has left.
Quilting Arts is a specialty mag for the art quilting folks and is the most contemporary focused as it features many crossover art techniques and embellishment/mixed media ideas.
Piecework has one issue a year devoted to quilting, interesting other issues on various needlecrafts.
Outside of the U.S. mags (British, Irish, Australian,etc.)are jewels in their cultural highlight differences.
Just a quick overview from my perspective - thanks for starting this thread to reflect what people are reading these days.