Numbers don't matter in a competition. As a judge, you have no access to the OG/FG/IBU data.
The real question is, how does it drink?
If it drinks like a hoppy, bitter, moderately strong roasty ale... then it's an American Stout.
If it drinks like a black, roasty barleywine... it's a RIS.
My bet is that it'll be an American Stout.