I'd say get all three. In my experience, all of my schools took all three of my letters, even though most only required two.
I don't think it matters that you had classes with 150 plus people. I got 5 LORs and a couple were from really large classes. It's important to remember that professors work for you; what's a teacher without students?. It is their job to write recs and most will be more than delighted to write you a letter. If you just meet and have your spiel ready about how you want to go to law school and how you felt their class helped you they will jump on the chance. (That was the case for me) I also brought a paper I wrote for their class, transcript, resume and a copy of my personal statement for them to read. Also be sure to give an envelope with stamps on it! Good Luck and hope this helps! P.S.- I think the academic would write a better LOR than any employer. Teachers want to see their students succeed and a teacher will tell you no if they won't write a strong letter. A teacher I had in a large class, but had the highest grade, wrote me a stellar recommendation ( Assistant dean told me about the rec) even though she really never had an opportunity to really get to know me.
I don't think it matters that you had classes with 150 plus people. I got 5 LORs and a couple were from really large classes. It's important to remember that professors work for you; what's a teacher without students?. It is their job to write recs and most will be more than delighted to write you a letter. If you just meet and have your spiel ready about how you want to go to law school and how you felt their class helped you, they will jump on the chance. (That was the case for me) I also brought a paper I wrote for their class, transcript, resume and a copy of my personal statement for them to read. Also be sure to give an envelope with stamps on it! Good Luck and hope this helps! P.S.- I think the academic would write a better LOR than any employer. Teachers want to see their students succeed and a teacher will tell you no if they won't write a strong letter. A teacher I had in a large class, but had an A, wrote me a stellar recommendation ( Assistant dean told me about the rec) even though she really never had an opportunity to really get to know me.