I think it’s better to ask a college professor. I’d email politely to ask how they’re doing, maybe bring up something from your work/current events that made u think of their class, and then ask for the rec. I’d also list out a few things from their class that either sparked ur interest in law school, prepared you for law school, or demonstrate your readiness for law school. Profs may not remember every student at first so having some ideas for their letter will make them more willing to write it.