Thanks for the input! What are the advantages of OJS, in your opinion?
My initial thought about this is that since OMP can handle ISBN, it would be a good fit, at least for proceedings that are already being assigned ISBNs (not sure what the common practice is for proceedings?).
On the other hand, OJS is better at representing separate papers/articles with a dedicated landing page for each submission, which would just be a long table of contents with no abstracts.
There’s probably alot more to it, stuff going on under the hood, different possibilities of exporting and getting the content harvested that I haven’t got a slightest clue about.