I can comment on this as I had to make that very same decision just a few weeks ago. I picked Baylor. You surely got the letter from one of the BU deans...tuition will exceed $50k, and continues to rise. Cost of living in Boston is quite high as well.
I loved the city of Boston, but BU itself wasn't my cup of tea. Although Dr. Witzburg presented it really well. He's the coolest person I met on interview trail.
If you're out-of-state at Baylor you can purchase a condo and gain TX residency easily, which will bring your tuition/fees down to ~ $15k - a sweet deal! Baylor is ranked higher than BU and will not hold you back for residencies. I saw their match table when I visited 3 weeks ago - it is impressive. People go all over the country.
All in all, go with the one that gave you the right feel. Few people turn down JHU because they hate Baltimore. Even fewer go to Georgetown cause they like the city. Yes, the city/location is an important variable, but it should not be
the determining factor.
Good luck with your decision. Both are great schools. If money is not an issue, you will have no regrets either way.