@Darudius Let me reword that then: Emi, at least what we've seen of her, is a better person than the FMC and would be better to date, because she hasn't been shown to be hugely manipulative and controlling, two things that are big time no-gos in a healthy relationship.
Pretty much anyone would be better than the FMC. She's like a really badly written Senjougahara, who already had some of those worrying traits.
I'm just hoping she changes for the better, but seeing as we're 20 chapters into a monthly manga and no progress has been made on that front, I have my doubts that it will happen.