Understanding the difference between חוקים and משפטים (as they exist within every מצוה), we appreciate why דוד's praise of תורה in that it is greater than the world (זמירות) is emphasized specifically within חוקיך: Specifically by חוקים do we see how the details of the מצות - how they energize the world - are insignificant, and a מצוה is instead purely about Hashem's רצון.

To further highlight this quality of חוקים, we bring עדות into the discussion: עדות is the quality of a מצוה in that it brings down and expresses the עצמות of Hashem - what is otherwise inherently concealed - in the world.

How is this different than חוקים? Stay tuned...