Ravens have a good match up this week, but haven't been a great fantasy option this season. SD has a number of good match ups throughout the season and I wouldn't drop them to get Bal. For this week, I would just ride with the Titans and see how it goes. Granted I do believe that the Ravens will do better than either of the other D's this week, but I also think that overall you'd be losing more because SD would probably be snatched up.
10 Team; 1QB/2RB/2WR/1Flex/1K/1D; Standard; Non-ppr
QB: Vick, Orton
RB: Forte, Bradshaw, Addai, Lynch
WR: D.Jackson, S.Smith(Car), Garcon, Bess, Blair White
D: Phi, Ari