The Amazing Race, because of the challenges and the scenic "tours" contestants complete. Lot's of fun and hard work; and people see inside of their relationships with their partners.
The first time I saw Survivor I thought, "OMG, it's just like the workplace!" I hate the politics and game-playing. imo --It's a lot like the shows put on by the inferior levels within the larger Professional Wrestling phenomenon. I think Survivor targets a baser common denominator among viewers and it works - makes lots of money. But not from me. Just my opinion.