My intuitive response would be "Don't pick 50 years of torture, you'll die!" Which is generally the case. It's explicitly not the case in the first scenario, because of the "but with no lasting harm." caveat. But without that caveat, I doubt I would survive 50 years of torture, which means that what would happen afterwards is useless, since I'd be dead.

Being dead does not seem to fit the description "have a satisfying and fulfilling life for 3^^^3 days" with or without the caveat. Instead you should be concerned that the "lasting harm" changes you in such a way that what remains is still 'satisfied and fulfilled' but in such a way that you as of now would not consider the outcome desirable or would consider the person remaining after the torture to be sufficiently not-you-anymore.