RAW processing software,.....Which is the SIMPLEST program?

LR4, Aperture, Photoshop, Capture One and so one.  Give the trial downloads a run.  What I like, the other person may not like.  It's like picking a camera, which interface & features you are most comfortable with & find useful.

I know some software they say has better output than others, but they are mostly very close.  RAW is about control over your photos in your digital darkroom (software).