I began looking at this after finding a boundary=region in Ladakh, India
that caused this region admin_level=5 not to show up in nominatim or on
the main map.
Of the tags mentioned below only place=region has a wiki-page where it
is not marked as deprecated.
I much prefer boundary=administrative + border_type=region over
boundary=region and place=region.
What do you think?
Stats:
https://taginfo.openstreetmap.org/search?q=region#values
7 362 border_type=region
3 209 place=region
And
338 boundary=region
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