If you believe the MWI, then the choice is trivial: one regular world before, one happy world after.
I think this is where you're losing people. Why isn't it "one regular world before, 999999 horrifying wastelands and 1 happy world after"? (or, alternately, "one horrifying wasteland with .999999 of the reality fluid and one happy world with .000001 of the reality fluid"?
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.