Is it better to know you're terminally ill and be given an estimate of how many more months you could expect to live? or to die suddenly?

I just found out my best friend’s father was given 3–6 months to live. It’s not a total surprise as he’s already had some tumors removed recently.

The situation unsurprisingly has me thinking about mortality, and wondering if it would be better to be given a timeline ahead of time so you can try to resolve your affairs, prepare your friends and family, say goodby to loved ones, etc.? Alternatively, if death comes suddenly, you wouldn’t have the lingering thoughts of your demise overshadowing your final months. What do you think is the better way? Is ignorance bliss?