Primaloft One has a clo/oz/yd2 = 0.92 according to primaloft.com
Apex = 0.82 according to thru-hiker.com
Primaloft One will weigh a little less for the same warmth. You also have the weight of the fabric on both sides which is the same for both.
like Chris said - Apex less quilting, just around the edges according to what people have said on this site, One - 3 inch spacing in both directions for under 100 gm/m2 (4.25 oz/yd2), 6 inch spacing for heavier, according to primaloft