Um, lots of choices. If it were me, I might consider Middle River, there are lots of marinas there so it keeps the slip cost competitive and plenty of water depth. The lower salinity keeps out the jellyfish if you enjoy taking a dip once and while (Hart & Miller is a nice place to clean the bottom of your boat BTW)
On the down side; There are a lot of power boats on the river and on the weekends its gets pretty choppy, also you will find a considerable amount of crab pots at the mouth and near Hart & Millers Islands.
My Aunt and Uncle lived in Aberdeen and kept their Bristol 35.5 at Maryland Marina off Middle River and loved it there. Not much on the Bush or Gunpowder for sailboats, and its not unusual for Aberdeen Proving Grounds to close off the rivers (Bush and/or Gunpowder) when they are testing.