You would be able to have an idea of how many audiences you can get

If I choose a country, I would be able to know if there are audiences matching the criteria I'm looking for or not. And it's also easy to integrate into Adform if we can't find any audiences in Adform.

I can choose which countries I like to target. I can create many segments. I can choose which audiences I'd like to be included in the targeting. I can also exclude some.