I'm currently typing up some lecture notes for a university course, and I'm having trouble deciding how exactly I should typeset the title of the document. The title consists of the subject abbreviation, the course number, and the course name. For example, if I were typing up notes for an abstract algebra course, I'd title the document something like "MATH 123: Introduction to Abstract Algebra". Here is that title typeset in Libertinus Serif with different combinations of capitalization and figure styles:
Option 1 (all caps and lining figures) is what I currently have. The abbreviation looks out of place since it's all cap-height, which is why I'm considering the other 4 options. However, none of them stand out to me as particularly good solutions.
On one hand, Option 2 (small caps and lining figures) and Option 4 (small caps and text figures) both preserve the uniform capitalization of the abbreviation but look somewhat strange since the abbreviation clashes with the rest of the title case text. On the other hand, Option 3 (mixed caps and lining figures) and Option 5 (mixed caps and text figures) fit with the rest of the title case text but don't preserve the uniformity of the abbreviation's glyph heights (plus, the mixed capitalization would look really strange if the abbreviation weren't a real word, such as "CS" for Computer Science).
Answers to other posts don't seem to share a consensus on the matter. This answer recommends preserving the capitalization while this one and this one recommend preserving the abbreviation, and most simply recommend rephrasing to avoid abbreviations at the start of a sentence. My situation is somewhat different since I'm not typesetting running text and there's no good way for me to rephrase the text.
Since this appears to basically boil down to personal preference, which option would you prefer and why? I'd like to hear some other people's opinions on the matter.