Does type of counsel make a difference in the court room?

The sentencing phase of the criminal process is subject to much scrutiny. Much like the arrest decision, decisions at sentencing have been criticized for being biased and impartial. How valid is this criticism? What is more important when sentencing an offender: legal or extra-legal variables? Provide empirical support for your position.

The public generally views defense attorneys as too zealous in their advocacy of clients. Additionally, many portray an image of defense attorneys, particularly public defenders, as too willing to plead their clients guilty. Does type of counsel make a difference in the court room? That is, is it more beneficial to have one type of defense counsel over another? Or does it not make any difference whatsoever? Provide empirical evidence to support your position