Whole groups: Crucible (not actually a novel); Narrative of the Life of Frederick Douglass (also not a novel); Gatsby; Catcher in the Rye; The Awakening; As I Lay Dying (occasionally); Scarlet Letter; How to Teach Literature Like a Professor

Small groups: Any of the above + The Things They Carried; In Cold Blood; The Poisonwood Bible; Grapes of Wrath; The Road; A Farewell to Arms; Song of Solomon; Brief and Wondrous Life of Oscar Wao

There are more but I'm drawing a blank at this moment. AP Language & Comp is primarily a nonfiction course, so small groups or individually for novel reading is generally how I go; I use mostly nonfiction in the whole class mode.

More and more I'm teaching in small groups to allow for more student choice and variety (and fewer restrictions by the district).