What would it mean to examine this issue dispassionately? From a utilitarian perspective, it seems like choosing between deathism and anti-deathism is a matter of computing the utility of each, and then choosing the one with the higher utility. I assume that a substantial portion of the negative utility surrounding death comes from the pain it causes to close family members and friends. Without having experienced such a thing oneself, it seems difficult to estimate exactly how much negative utility death brings.

(That said, I also strongly suspect that cultural views on death play a big role in determining how much negative utility there will be.)