Thing is your brain might linger for a while longer when your beheaded and you may get a few moments to a couple minutes more of life with your brain screaming for oxygen.
Being burned at the stake however, there is a good chance you’ll pass out from smoke inhalation and possibly even die before the flames have a chance to do serious harm.
So beheading isn’t as painless as one might believe and being burned to death at the stake has a very good chance of being a lot less painful than one would imagine.
Anyway, Line up those Jefferies, I’m getting “stoned” to death.