Do you prefer regional variants or convergent species?

I'm not sure I understand the difference aside from convergent species being new species in the Pokedex. I couldn't see why the convergent species in S/V could be their own Pokemon but my favorite Pokemon - Galarian Rapidash couldn't be.

Convergent species might be preferable if not only because it seems more likely they'll appear in future games freely to catch in the wild. Whereas regional variants tend to be relegated to in-game trades/quests or just aren't ever available. =(