Would this be a more or less humane way for the U.S. to execute prisoners? (Details Inside)

I found this quote in a Reuters article about North Korea: “In May last year, the North executed its defense chief by anti-aircraft gun at a firing range, the South’s spy agency said in a report to members of parliament.”

With most U.S. States having gone the lethal injection route and several now having difficulties acquiring the necessary drugs to make the required chemical cocktails, should States such as Texas, which is No. 1 in offing prisoners, consider this form of execution as a replacement?

Given the choice, would you personally choose to be executed by firing squad, hanging, electric chair, lethal injection or shot to bits by an anti-aircraft gun at close range?