X-risk is still plausibly worse in that we need to survive to reach as much of the universe as possible and eliminate suffering in other places.

Edit: Brian talks about this here: https://foundational-research.org/risks-of-astronomical-future-suffering/#Spread_of_wild_animals-2

S-risks: Why they are the worst existential risks, and how to prevent them

by Kaj_Sotala 1 min read20th Jun 2017107 comments