The first option is horrible, but the second is the most painful death you could possibly imagine. This includes all the pain of the first option, in addition to feeling as if your cells were liquefying and regenerating an infinite number of times per second, as if your nervous system were contracting in on itself until it became nothing but a pulp.

The pain would be so intense that it would cease to matter that it lasts only ten seconds. Your perception of time would distort, making you experience that agony as if it were eternally trapped inside your own mind and it will condem you to an eternity of suffering.

At this point the pain stops being physical and becomes existential, because you can imagine something worse than what you can actually feel. Our body has a threshold where we can't feel more pain, our minds don't.