I actually started this thread about bis, not the whole arm or tris. Short peaked vs closer to the elbow and full. Although, one can have a extremely short bicep insertion like Kamali and have effed up bis as a result.
In terms of biceps, Ronnie nudges Priest out, due to Ronnie having double peak bis, which is rare---Boyer Coe, Marko, are among the few. Melvin Anthony shares a destinction of having even rarer biceps. One of his biceps has a double peak and the other does not.