In the meanwhile, wikipedia ships wikidata, which uses RDF dumps (and probably 8x less compressed than it should be).
https://www.wikidata.org/wiki/Wikidata:Database_download
There is room for a third option leveraging commercial columnar database research.
ZIM uses zstd so it is pretty compressed--but the thing that takes a lot of room is actually the full-text search index built in to each ZIM file.
Unfortunately the UI of kiwix-serve search doesn't take full advantage of this and the search experience kinda sucks...
Have you done anything useful with RDF? Seems like it is just one of those things universities spend money on and it doesn't really do anything
For web content they recommend gzipped WARC. This is great for retaining the content, but isn’t easy to search or render.
I do WARC dumps then convert those to ZIM for easier access.