I think if I had a choice, it would be the firing squad. I have no desire to torture them, just eliminate them from the living as soon as possible and yes make sure they are guilty first.
I agree . If execution must occur, a full firing squad is best. I have heard of electrocution attempts where it took up to three times to kill them dead.Not a job I would ever want though. With a firing squad, it is unclear who shot the killing bullet.