The first question to be answered is what are you going to do with the rifle.
If you plan to go hunting varmint, the answer is simple.
Swiss or SL8 = non restricted.
If you want a target rifle that will be used at a club only, AR is the answer.
In regards to accuracy, the AR will outshoot the Swiss and the SL8.
The main advantage of the AR plateform is the ability to choose what componants will be added to the rifle.
My personal experience with a match upper came with the CLE(Compass Lake Eng)
These guys build Highpower Competition uppers that will shoot 1 000yds against M1A.
Mostly built with Kreiger barrels and the fast twist, an 80grs bullet will compete with a 308 and an 90grs will outshoot them.
The other choices you have with the AR are more on the ergonomics side.
Trigger and stock.
There is no way the Swiss and SL8 can come close to a Geissele trigger and having a PRS stock will allow you to put any type of sights and be able to be comfortable behind the rifle in any position.
In regards to price, the AR will be close to the Swiss and SL8 when your all done, but the rifle will be exactly how you want it without compromise.
The other advantage, you dont have to put 3 000$ right now,(for most of us poor people, 3 000$ is a lot of money

) just buy an out of the box AR and built it slowly when the money available and when your experience with the rifle lead you to make choices in what componants is right for you.
If you are not satisfied with one componant, just put it for sale on this site and pick another one.
I also hear about owners of the Swiss and SL8 owners claiming how accurate there rifles are, but never seen a good report with pics of target and loads.
PS; for those who will comment about the AR #### where it eats and the such.
Please read a book that was publish after the bible to understand that if you use good ammo and powder it is not an issue.
Books like the Black Rifle by John Feamster and the Competitive AR15 by Glen D. Zediker is a must.
2-PS; A CLE upper cost about 1100$