I know that PR is geared mostly towards the English language, but it is better than what we have today.
I have put AP style titles as the default, as that makes most sense to me … but I will throw it out there to see if there are people with strong arguments for Chicago style.
somewhere over the rainbow ->
Current Hugo:
Somewhere Over The Rainbow
Chicago:
Somewhere over the Rainbow
AP:
Somewhere Over the Rainbow
AP is good for me, and I think lends itself better to blog posts, news articles etc from what I have read. I actually use AP myself via Lingofy & AP subscription.
The Chicago Manual of style is the guide for authors, editors and publishers of books, periodicals and journals.
The AP Stylebook is the prime reference for those in the news and public relations fields.