After seeing LI and Electrocution both up close and personal, I believe that the LI is allowing the condemned to simply fall asleep and fade away. The one who was being Elec'd was VERY fidgity, nervous, etc...now I know this could be personality type and/or due to sedatives, etc, but to me, the Elec was a much better message to me as a viewer that you shouldn't kill or the State could do this to you.
Know I know that you also has to consider that with any ex you've got the long wait and living as a condemned person, yada, yada...but I'm simply talking about the day of and the procedure. I'd personally like to see all DP's go to the Chair just for the "oh shit" factor. Why do you think so FEW people on DR choose it? Kinda says something there, huh?