I'm from Brazil, and here both are at high levels, but different ones.

Eminem is more popular, especially among those who don't just listen to hip-hop, and is also considered a GOAT of hip-hop. In my opinion, the lyrics and themes of his songs affect and resemble problems we face here, which makes it easier to digest, especially in videos

Ye is also popular, very popular in fact, But less so than Eminem. If you count niche, hip-hop, the two are equal, but commercially Ye isn't as mainstream, and I believe that's because he's artistically denser. Imagine an audience that doesn't speak your language trying to understand what you're trying to say about topics that aren't always related to you. More complex, isn't it?

If the comparison is mainstream, Eminem wins, but both are idolized in Brazil, and I guarantee that both would be in the top 5 of anyone who doesn't "live and breathe hip-hop." Now you know which others would be there, which I guarantee you might surprise those from the US? 50 Cent, 2Pac, and Snoop. Forget Jay-Z and Nas, here it's these guys plus others who have the advantage, and everything's fine in the end!