I've used the PA red dot and liked it well enough. I like the Trijicon RMR much better. I have the RMR atop my 300blk pistol. I pulled the PA dot off my 5.56 AR and put it on a muzzleloader.
The rest of my ARs now have variable power scopes or Irons. I really like the 1-4 and 1-6x scopes for close work/hunting. You can crank them down to 1x and use them both eyes open like a red dot AND increase magnification for much farther shots. Keep in mind that the small end of red dot sizes is around 3moa on most units. Properly sighted that's 3 inches at 100 yards, 6 inches at 200. That is quite a bit of target covered by a fuzzy dot.