I went and checked the Twitter raw since the TL wasn't completely clear to me.
Eiji's friend is trying to say, "Compare your character type, to this girl's character type, at face value. Ask yourself, which one of these character types is more likely to keep being loved? Which one's more likely to be thrown away?" He's not directly commenting on the two of them, but rather trying to make Eiji feel a little pressure to pay close attention to her feelings and not act too "thick-headed". Maybe a little presumptive of him since the two of them love each other very much, but he has a good heart. ...Of course, silly Eiji reacts by panicking and jumping onto the stage (the raw's language is more clear that he's telling them to stop the marriage, lol).