I know there is some thread about the use of these but I am having mixed feeling about the Excaliber II & Whites Duel Field. I hear a lot of good stuff about both machines, But which is the best one to use? I am by the beach so either one would work but which is easier to use or which one can I determine what is detecting trash or goods? I just don't want to be digging up a bunch of trash. I see there is about a $300-$400 price difference between the 2. Is one better than the other or is it just by preference? The Excaliber has the discrimination but the Dual Field is deeper and digs everything I hear. Thanks