Cicada,
I don't not really have much experience with either program (besides being accepted to MAPH as well), but my gut instinct is that UVA is probably the better choice. I think the program at UVA is probably much smaller, and thus would allow more access to faculty. I have heard from one or two former MAPH students who said that they felt like they had to fight to get attention from faculty. This issue becomes important when it comes time to get LORs.
While Chicago's English program is obviously a TOP program, I think UVA's MA would probably have a higher ranking than UChicago's MAPH, if such a ranking of MA programs existed (maybe it does). It is just my impression that UVA would likely lead to a more successful placement in a PhD program than Chicago.
Again, I don't have any real experience with either program, this is all just my impressions. Hope it helps!