If I were you, I'd go to Wake Forest. Don't let the ethnicity of your peers determine where you go to school. You have no idea what kind of personalities those students have. If you do or already have judged them, then realize that you're no different than the white person prejudging a black person and assigning stereotypes. If you're use to being around predominantly white people, then a medical school of such shouldn't sway your decision. I'm the same way, where I grew up in areas with a majority of white people and few blacks. I don't mind being around either, but if I had to choose between an HBCU and another med school, I can assure you that the prospective race of the students would not be a factor.
However, it is always best to go to the place where you think makes the best fit. If that happens to be a HBCU, then by all means go there, but do so only because you feel much more comfortable (and your comfortableness being a top priority)
Just know this, that unless you plan on doing residency or practicing in a predominantly black area, then choosing a school based on its HBCU status, really doesn't do much to prepare you for diversity, in my opinion. Where do you want to practice? Keep that in mind.
All in all, try not to let the ethnicity of the student body be the deciding factor in your decision. In the grand scheme of things, there are far more important factors: clinical rotations, grading scale, pbl/traditional learning, location, available resources in regards to the school's focus (a school known for their radiology program will have some of the best rad docs in the business which a LOR would look great for residency, depending on what field you want to go in), etc...
Good luck!