single is favoured because its less glitched.
seeing as the shotgun gets "whipped" out by only 1 side, its not alot of area to pb.
seeing as dual sgs come out from both sides, sweeping down, all u gotta do is rss near an enemy and you'll pb.
dual > single
thats why no one likes dsg users.
and im not makin shit up, most dev's know this.