The most popular shoe worn by thru-hikers on both the Appalachian Trail and the Pacific Crest Trail is Altra trail runners. I think that in the US most of the people we would consider hard core hikers (and I am not in that group) have moved to trail runners. Hiking shoes and hiking boots are kind of persona non grata in those circles. Maybe this is a country-specific thing. But I have moved to trail runners and will never look back. Last year on the Mozarabe they were a godsend with all the walking in rocky river beds, and on the many off-road ascents they were fine.
If you do some searching on the forum, there are lots of great threads explaining why this shift to trail runners makes sense. For years, I wore boots thinking that I needed the ankle support. Well,
@davebugg and
@falcon269 burst that myth by showing me the studies that establish that boots simply don't give the support we think they do. If you need ankle support, a brace is the only way to go.
Another reason for trail runners rather than shoes or boots is because a lot of the camino primitivo is in fact on hard surfaces. From the time it enters Galicia, there is almost nothing but crushed rock, with maybe one or two logging trails through eucalyptus forests that are more dirt-like. And a fair amount of road walking in Asturias.
If you are inclined to go with trail runners, I would definitely go that route. Buen camino, Laurie