I’m late to this party so I’m assuming that Josh has already decided, but going to lay my experience here for other students who may find this thread.
Like you, I considered several colleges in the Southeast, including both HBCUs and PWIs. Much like you, I got advice from caring and well-meaning adults in my life that I should perhaps consider a “bigger” school. In some cases, they really meant a bigger school; in other cases, “bigger” was code for “whiter”. My dad really wanted me to go to Georgia Tech, and my mother wanted me to go to Emory.
I think it came from a place of care. After all, African Americans do face significant disadvantages, and it’s logical to assume that extends to graduates of black colleges. A lot of parents and adults believe that smart, accomplished black students would benefit a lot from have access to the same resources and networks that their white peers (often wealthier, always unburdened by racial disadvantages) will have through a college like UNC, Wake Forest, GWU, or Tech.
I fell in love with Spelman for the same reasons you fell in love with Morehouse - it was a place that was made especially for students like me (young black women of color), the culture was vibrant and distinct, and the students seemed to find success in many fields. I loved my experience at Spelman; I would never change going there for the world.
HBCUs are disproportionately responsible for producing black professionals across many fields - doctoral degree holders, physicians, engineers and other science majors, and others - despite having proportionately less support and funding, on average, than predominantly white institutions.
More than that, though, what my HBCU experience gave me was an opportunity to see myself in a variety of roles and imagine myself as a successful professional. Before I attended Spelman, I didn’t know any black scientists or doctors and didn’t even know black people could be scientists. At Spelman, I had many black professors - and our president was a black woman with a PhD in psychology - expanding my idea of what a black person “could be”. I remember seeing our president speak for the first time at freshman convocation and deciding right then I wanted to get a PhD, too. (And I did - in her field, even.)
As an HBCU grad, I have an enormous network - not just of the grads from Spelman and the AUC but from HBCUs in general. We tend to look out for each other in formal and informal networks. I know MANY black professionals in my not-very-black city and I’m always astonished at the rather high percentage of them that went to HBCUs. I once did a roundtable discussion in front of some leaders at my company with four other black professionals and discovered that 3 out of the 5 of us had attended HBCUs (the other two went to Howard and NCA&T).
Also, in my opinion, the social life is unparalleled. But that’s rarely a convincing argument for a parent 
As for the actual size of the school - well, there are pros and cons to attending a small school (just like there is for a large one), and it is true that it is more difficult to choose your professor for any specific class at a small college. But that’s such a minor detail that I wouldn’t use that as the basis to choose a college, IMO. Like most college students, not every professor I took a class with in college was my favorite, and a few were downright bad. But that’s not any less true at a large college, especially when you get into upper-level classes.