... letters are always better than pro letters. You should go with ... a pro letter only if you can ... obtain. So go with a pro letter if you need and ...
It doesn't hurt to send some "feeler emails" to prospective profs. If they say that they are not able to write you a _strong_ recommendation, then go with the pro letters.
Thanks for your patience! I had a few emails from the winners asking which photos we picked since some submitted multiple. Here are all of the photos we picked:
I've got an iPad Pro, an Apple Pencil, and the Notability APP and BR the test that way. The best part is you can export it as a PDF. But it's an expensive method.