Full disclosure, I don't enter competitions anymore. Hopefully you will get some feedback from those who do.
My opinion, if those are your choices, I would go with historical beer. Your description should be as complete and clear as possible, so the judges know what to expect. You might want to find a description on-line and use that as a template. It depends on the judge(s) your beer gets, but he/she should know that style well enough to know what its supposed to taste like.
Best of luck!