Both schools have superior IR programs. But if you’re going to apply to a top law school (Yale, HLS, Stanford, Berkeley Boalt, Columbia and the rest of the so-called, T-14) afterwards, this is where Berkeley shines.
The data I’ve gathered are saying Berkeley ranks within the top 5 or 8 nationally, almost always consistently, beating JHU, by a mile.
Also, try to visit Baltimore before making your final decision. It’s hard to like the place specially if you’re Californian.