You've got a bit of time, so I'd say do some testing first and discover your own reactions to the options. Color aesthetics are really variable from person to person, and one person's "natural" rendition may be another's "bland" or "overcooked".

Any idea what lighting conditions you should expect for the shoot? Can you do a "dry run" somewhere nearby in similar conditions to get an idea of how various films will render it?

-NT