What is better...The encapsulated in plastic type Lowes sells, or the traditional "paper" faced insulation Home Depot sells. The plastic seems kind of neat, but curious as to others opinions on this. I did feel the plastic was kind of thin. Do they both have the same vapor retarder qualities? It is for a walk out basement on the side that you walk out. On the earthen side, I will use XPS. Also, is it recommended to install a 6mil poly vapor across the entire surface afterwards for insulation improvement?