I'm not 100% on how fully intergrated the Hiya system is on Samsungs or how much control you have, but as far as spam control goes, over here in the UK it's pretty poor. Lots of false flags or nothing at all It would be good if we could submit suggestions to the Hiya database from our devices natively. Unsure if this is possible now the fact that Hiya has gone from a free to premium service (limited for free).
Services like TrueCaller or SyncME seem to have a much better hit rate for numbers in the UK, but not being intergrated you have to put up with overlays etc.😭
As it's a US company I feel it's probably much better across the water.