Both can be badly botched. As long as it won't be a blundering typical American executioner, hanging (provided it'd be a specialist of Albert Pierrepoint's stature.)
hanging, so long as my neck cracks immediately. Fortunately for me, I'm bony so it shouldn't be an issue.
All depends on the length of a rope. Too short and you'd strangles slowly. Too high, your head would come off like it happened to Black Jack Ketchum.
At least British came up with a professional measuring:
https://en.wikipedia.org/wiki/Official_Table_of_Drops(How the f**k come I know all this?)