The question you are asking is very very very broad
You are comparing a specific rifle ( Swiss Arms Black special etc ) to a family of rifles that will vary tremendously in price and barrel / trigger
If you have $3000 to blow, and you don't care about restricted / non restricted than I would buy a $3000 AR
I sold my Swiss Arms ( great gun but I don't need two non restricted ). Would I take this gun (over a run of the mill AR ) shure...because its a Swiss Arms
Did this gun outshoot all my AR ...NO . Its not fair to compare some of my ARs in the accuracy dept to the Swiss Arms ( Noveske...even my 10.5" ! , Satern ( cut rifle ), Krieger, WOA ...10.5" barrels ) since they are all higher end barrels with non standard chambers . The WOA , Krieger had Wylde, the Noveske has their Match Mod 0 . You would expect these guns to shoot better
The ARs that suprised me on accuracy was the Working Joe RRA Varmint . they have a 3/4MOA guarantee BTW. This thing was a great shooter...especially for the money. The other was my LMT MRP 10.5 . This was not their stainless match barrel but rather their chrome lined
One area that the ARs excell in is availability of triggers. You are kinda stuck with the Swiss Arms. AR triggers vary from god awefull to scary light. Boils down to how much you want to throw at it
If the non restricted of the Swiss Arms appeals to you then go for it. If it does not matter to you , then build yourself one of these ( both boringly accurate ). Top one is a Noveske, bottom is a Satern ( cut rifle ) barrel.