I would most certainly like to know how I die, that way I can avoid any possible situations that could lead to that specific death. Example would be, maybe I got run over by a train in my car. I would avoid train tracks and such in a way to avoid that death, or maybe I go out by a car accident. I could just not drive a car, switch over to a bike instead, or just walk, get my steps in. Unless I absolutely have to drive, then I will, but I'd have to be extremely careful.
Then, if I learn I die from old age in a peaceful way, I'm comforted knowing that my family won't have to see me go out as rough.
Knowing when only gives me a stressful countdown. I don't know how I die, it'll hit me by surprise. The when could be in two days, and that day I stay inside, but I have no idea how I die. I could go out with a heart attack, right then and there.
I just feel like the 'how' would help you go more cautiously, and then the 'when' is just a ticking timebomb.