All Natural all the way. It is more advanced, and more actively worked on that any other.
As for the interior brightness issues; yes that is true (due to all the work to give the impression of outside weather being reflected indoors as well) but something they are most mindful of, and constantly working on to improve. Although All Natural has been out for a long time, it has yet to reach the state of being called version 1.0 yet (very close now though) and this is due to the very serious intent of the team to get it just right before doing so.
All Natural has real lights and interior sounds (not sure which part does that). Just use All Natural

Real Lights is its own component - and really the only part that causes any notable framerate hits, at least in areas with a lot of lights - It is entirely optional for this very reason.
The interior sounds (Natural Interiors) component however is a part of the main mod itself.