Expert: I honestly get a mix of the two dungeons. I never get too many of Neverreap or Fractal in a row.
Trial: BISMARCK. ALMOST EVERY TIME, BISMARCK. If not Bismarck, then usually Steps of Faith. Occasionally something random like Hydra.
Leveling: Hakkue Manor and The Vault the most lately, with a bit of Garuda normal mode as well. Otherwise this is usually pretty random for me.