Degree doesn’t really matter, your work experience will matter more. There’s a list of requirements for FBI SAs and you need two years of work experience with a BS, 1 with a MS. Your degree won’t matter if you have LEO experience and it’s from a regionally-accredited university.
So instead of worrying about your degree, worry about building a strong law-enforcement resume.
Better yet, make sure your degree can be a strong backup degree if you wash out of LEO work. It happens to a lot of people.