Is life without a parole a better option than the death penalty?

This link gives different viewpoints on whether life in prison without parole is better than the death penalty. Various sources give their opinion to this question, some agree that life without parole is better than capital punishment and some disagree on that opinion. Once they have agreed or disagreed, they give evidence as to why they think so. For example, The American Civil Liberties Union thinks that life in prison is better than the death penalty. Their reason why is: "The death penalty costs more, delivers less, and puts innocent lives at risk. Life without parole provides swift, severe, and certain punishment. It provides justice to survivors of murder victims and allows more resources to be invested into solving other murders and preventing violence. Sentencing people to die in prison is the sensible alternative for public safety and murder victims’ families."
http://deathpenalty.procon.org/view.answers.php?questionID=001017