Ok, I went too far. Sorry. But LotR would be better because of several reasons:
1. Won't become outdated. Tolkien's Middle Earth has been around for 76 years and is still going strong. Let's see how HTTYD holds up in 72 years. Chances are it will be forgotten.
2. Wider appeal. Again, LotR has a wide appeal, mainly from 10+. This will work perfect for everyone if they have a Sire section and put kiddie rides there, plus have bigger rides for older audiences.