As long as you use the two systems with the degree of specificity that you've done in your question, it ultimately won't matter, because they tell you the exact same thing. As you've mentioned, major/augmented chords use uppercase Roman numerals while minor/diminished chords use lowercase.
- Should Roman numerals be capitalized?
- Can Roman numerals be lower case?
- What is the difference between lower case and uppercase Roman numerals?
- What are uppercase Roman numerals used to indicate?
Should Roman numerals be capitalized?
In most situations, Roman numerals are capitalized.
In fact, the word “capital” came to be used for the letters because they were used at the top of Roman columns, which was called the capital.
Can Roman numerals be lower case?
Roman numerals are essentially known as uppercase letters: I, V, X, L, C, D and M. However, it is possible to use lowercase letters: i, v, x, l, c, d and m. Lowercase Roman numerals are often seen as page numbers for materials prefatory to the beginning of the main body of a work.
What is the difference between lower case and uppercase Roman numerals?
Typically, uppercase Roman numerals (such as I, IV, V) are used to represent major chords, while lowercase Roman numerals (such as ii, iii, vi) are used to represent minor chords (see Major and Minor below for alternative notations).
What are uppercase Roman numerals used to indicate?
Uppercase Roman numerals indicate a major triad, while lowercase symbols represent a minor triad. This style deviates from traditional Roman numerals, which don't use lowercase letters.