I chose to file a report but not press charges. I am very thankful that I lived in a jurisdiction in which this was an option.
The detective with whom I met was very kind and understanding and was also very honest about where he saw an investigation / possible trial going. It was a "he-said-she-said" ordeal - because I waited over a month to even file a report (it took me that long for me to even admit to myself that what I experienced was indeed rape), there was no evidence.
My mom was dying with cancer at the time, and so I didn't want to put my family through that added stress, especially as most likely nothing would have come out of it. I did however agree to cooperate if any other woman came forward against the same individual, and I also filed a report with my university - the person was a student at the same campus. It was put (invisibly to the student) on their record.
Sometimes I wonder if I did the right thing or not, but I also know I couldn't have gone through an investigation/trial emotionally myself at the time, and I wouldn't ever have wanted my dad or my mom to go through that either.
My mom died roughly six months after I was raped. I did, however, tell my parents about it, which was inexpressibly difficult. I felt guilty at bringing that kind of grief into their lives, especially as my mom was sick and we knew she was dying, but I also wanted and needed to be honest with them and not hide anymore.