What paperback should i read next?

Pandemonium  - Lauren Oliver Lothaire (Immortals After Dark, #12) - Kresley Cole The Girl in the Steel Corset - Kady Cross

Do I go on with the Delirium trilogy and start book 2, Pandemonium, read book 12 of Immortals After Dark, Lothaire, or go for steampunk book, The Girl with the Steel Corset?