I am totally confused regarding using Roman numerals versus Arabic numbers for designating chords in charts. I am writing some charts for a very important gig and want them read correctly! Two guys I know who will play, their charts are plain numbers (Arabic, regular numbers). But on forums, posters say, no, the correct way is Roman numerals. What is the usual in Nashville? (I want to learn the right way.)

Whatever the answer is, I have a few more questions. Thanks.