Exposing to the right side of the Histogram...

In a recent workshop a question was asked regarding the best way expose in RAW format.  The question went something like this...   So, if I create two images, one shot at two stops over the metered value and one shot at two stops under the metered value the two stops under will be a better image?  The answer was "yes".  I don't entirely agree.  Ok, let me explain...