Hard to say, as they are both associated with Sag/9th house. I think Uranus in the 9th house means you have a unique philosophy, and that might be easier in academia than in legal practice. Mercury in the 10th house is a more of a writing placement. But in the other hand, your 10th house is on the cusp of Pisces, which would be more about helping people. The north node in Leo suggests a performer, could be expressed in the classroom, so... I lean towards academia for you.