I'm going to be a bit morbid here, but of all the diseases or mechanical ways to die, which would be your LAST CHOICE if given a preference. Dead last, so to speak.
Well that's one thing that's becoming clear. It depends on what you fear, not what is objectively "worst".
Is pain worse than the isolation and hopelessness of dying unreachable, upside-down and alone in Nutty Putty cave? Or is pain worse than dying with no emotions but fear and horror, like with rabies? Or is pain worse than the slow, inevitable fading of the self that comes with Alzheimer's, dementia, or prion disease? Or how about being in the hands of hostile enemies whose joy is to give you a slow, gruesome death?
Where we die is irrelevant - we all die alone. Upside down in a ravine... as long as it doesn't hurt. Death comes for all of us - I simply don't want it to hurt.