I've owned both AAR and Sled City over the years so I can only say this...
AAR once produced a nice sturdy quality scoop, then they joined up with Stinger. The last Stinger version scoop I had was a nice scoop on the show side, but cheaply built on the inside, and physically flimsy in terms of structural build quality and vehicle attachment. I couldn't get rid of that one fast enough. That was in 2012... Has AAR (Stinger) changed since then... I don't know, you tell me? I have pics of the poor quality P.O.S. that was shipped to me. Lets hope they've improved since then.
Sled city has always produced a structurally stout scoop, with a real sturdy mounting system which makes them all but impossible to rip off the hood.
There was a brief period a while back when Sled City was having issues filling their orders, that really soured a number of peoples trust in Sled City products.
As far as I know that's all in the past now however? I know a few folks who have purchased them within the last year or so with no issues.