The main difference between the scopes is that the Burris is made in the Philippines and the PA is made in China (the Burris mount is made in China...I went with a LaRue QD mount).
The PA scope also has a different reticle, and only one color illumination.
The Burris is GTG. The eye relief is excellent. The optics are clear edge to edge and the adjustments are fine and precise. I am very happy with mine.
Two things I do not like about either scope:
I do not like that the illuminated reticle is visible from the front of the scope. But I rarely ever use the illumination.
I also do not like the goofy rails on the scope. I removed the rails from mine.
Burris also make an ARD for the AR332 but I prefer to use the shade tube.
NRA Life Member (2003)