The degree of precision in USNWR rankings is not as great as you seem to think- and much, much less important than 1) what you can afford and 2) which suits you better. I am a fan of both JHU & UMd - in general and for ME- but they are really different places to study.
And, not to put too fine a point on it, but until you have (affordable) offers from both, it doesn’t really matter where you put either of them on your list.