Leveler is better than Constellations for sure. Constellations is amazing amazing amazing, though, so that's not saying a whole lot, except that Leveler is even better.
And yeah I can name every song when I hear it, still can't do that well with Constellations save for Marianas Trench, Meddler, Meridian, Crusades, Indonesia, and Ocean of Apathy. There's actually a lot more diversity in Leveler so yeah... you definitely need more listens.