I think these two are the most patient princesses (even if they might lose their temper sometimes - Cinderella with Lucifer and Tiana with Naveen), but Cinderella slightly more because, after all, she wasn't paid in return for her work and she was insulted daily (or close to that). But it's only the tiniest bit that sets them apart.

She is more patient than Cindy. Cindy loses her temper too much with Bruno. Plus, Tia was always hopeful and she kept waiting and waiting to get her restaurant and never got frustrated, until Mr.Fenner ( i DESPISE him) gave the restaurant to someone else.

Cindy is patient, especially by being kind to her stepfamily no matter what, but with Tiana, I see more patience with her.

If Tiana was that patient, she wouldn't have been working multiple jobs at once. She would have taken her time to get money for her restaurant.