Looked on the Snapfish website, and their fleece follows the standard descriptions for each type. Check the second image on each web page to see the loft of the solid color base material type.
http://www.snapfish.com/snapfish/fe/create-artic-fleece-blanket
http://www.snapfish.com/snapfish/fe/create-plush-fleece-blanket
Arctic fleece is a medium weight fabric with a low loft to the material. This is the type of fleece fabric bought to make tie blankets. It is sometimes sold under the name blizzard fleece or Polar fleece (trademarked fabric). Enlarge the image in any of these links to see the loft of the fabric.
https://www.fabric.com/apparel-fashion-fabric-fleece-fabric-solid-fleece-fabric-wintry-fleece-fabric.aspx
http://www.fleecefabriccn.com/wp-content/uploads/2013/04/polyester-polar-fleece-blankets-7.jpg
http://www.amazon.com/DaDa-Bedding-BL6116061-Striped-Blanket/dp/B009HENWZA
Plush fleece has a high loft (plush) which can feel as silky as fur. The density of the weave can give the material a heavier feel. Is sometimes sold under the name microfiber plush, minky, or miroplush fleece. Enlarge the image in any of these links to see the loft and soft silky plush.
https://www.voguefabricsstore.com/Cuddle-Fleece-Baby-Pink.html
http://www.wayfair.com/Serta-Luxe-Plush-Micro-Fleece-Blanket-3853380-XS3247.html
http://www.amazon.com/Serasoft-Polyester-Blanket-Size-Color/dp/B009QTE7TQ
http://www.groupon.com/pages/gg-microplush-fleece-blanket-options
Both types of fleece are made of polyester, are light weight and warm, and are easily washed. Do not use fabric softener on the fabric as this will clog/block the breathable nature of the fleece.
http://www.webundies.com/wordpress/2013/03/plush-fleece-whats-the-difference/