Only issue I've ever seen with AR's was an Olympic that double fed, and that only happened with Wolf ammo.
The most reliable Semi Auto I've ever owned is the RIA I carry now, bottom of the barrel price wise, top of the line for accuracy and reliability.
Opinion things like this aren't really worth a crap, every one knows that the Sig Mosquito is a jamming piece of crap, except for the 2 people on here who love theirs.
Every gun is different, I've heard people complain about their T/C Contender jamming, so buy whatever you like the look and feel of and then take it from there.