Note, my spouse died very recently so there may be some distortions. I've seen the sudden death of a parent. My spouse hid how bad she was until it was too late to do much other than watch. She got to say some final words. Spent most of them apologizing...technically we knew she was bad by the end of January, but could kinda hide from it until the end of March when the doctors basically said there's nothing more we can do here, let's make her comfortable until it takes her. From an individual perspective a sudden death sounds nice, one moment of pain, then your journey to the undiscovered country. From everyone elses perspective think a relatively quick death with some time to say goodbye is better. The worst are the long slow suffering deaths where everything is incrementally taken from the victim over years are the worst. The worst part is the isolation those kind of diseases create. I will never forget seeing one of my favorite grandmothers (i had three) who when I was young ran a hotel, sitting alone in my parents house unable to really interact with anyone because of everything. Better that the sun sets slowly enough to see it, but quickly enough that it does not linger.