Okay. Assume this is an investment. Let's use the numbers from the most recent grads on file (2013), and ignore the four year option and scholarships (numbers from lawschooltransparency)-

SCU-

42.2% employment score (this is the number of people who successfully start a career in the law by working at a job that requires a JD, but does exclude contract jobs, school-funded jobs, and solo practitioners (which are very few in number nowadays).

22.7% are unemployed (defined as unemployed in any job, even after bar results).

Tuition is $47,040 per year, increasing at an average of approximately 4.56% a year over the last five years.

SLU-

50.5% employment score.

15.9% are unemployed.

Tuition is $38,435 per year, increasing at 2.2% over the last five years.

So, assuming you are completely average, and ignoring inflation and debt servicing, then one way you could calculate an expected return is as follows:

SCU: 47040*3 = 141120 / .422 = 334407.58

SLU: 38435*3 = 115305 / .505 = 228326.73

(This would be the cost of tuition per annum, times the number of years. Then divide it by the expected likelihood of finding a job. This gives you a raw score; lower is better.... in other words, a schools with a total cost of 100k and a 50% chance of ending up with a job has a true cost, or score, of $200k by this method).

Now, you can tweak the numbers by adding in cost of living. By putting in scholarships. If you feel adventurous, you can add in expected tuition increases, and also add in the added cost of the debt load based on current stafford, etc. rates. But this should give you a decent place to start to compare. It's cost + job opportunities. Also, before anyone says that yada yada the job score penalizes SCU unfairly, note that it also tracks the unemployment rates of the schools, and, in addition, SCU has non-reporters (not a good sign, so I'd add that 2.2% to the unemployment).