I think the food at Mama Melrose is slightly better than at Tony's, but the atmosphere is much better at Mama Melrose.
If I could name only one thing to sway me between the two though, I would have to go with the chocolate cake at Mama Melrose's. It's wonderful! Small individual chocolate cake, filled with a warm liquid chocolate center, then drizzled with powdered sugar and raspberries. I love that cake!