Well, if s/he files for you as a fiancee, then you'll get your interview sooner. However, it will cost more because you'll have to pay more to adjust status once you're here (if you have to leave at all...which you only will if you entered without inspection). If you file as a fiancee, you save around 6 months of time, but pay around a thousand dollars more. Again, though, this only applies if you entered without inspection. If you came here legally, or through misrepresentation, and have since fallen out of status, then you can adjust here and don't have the option of the fiancee visa, because the point of the fiancee visa is to get you here so you can get married.