HTTYD isn't worse, but we would all agree TL is horrible theming, probably has anemic merch sales, and the rides are fun, but pale in comparison to Disney's offerings. The RIDES are better, but the themes are not (well, Kali is pretty bad too). I'm hoping this park has great rides and themes.
I'm afraid HTTYD will be a fairly dead IP in 4 years. Just like SLoP. Disney gets enough crazoid fans that will buy anything, like 50 dollar toys that sit on their shoulder that are essentially worthless once you get home. I don't think Universal has the hardcore fans like that. Disney can sell $30 Brer Rabbit plush, but I'm not sure Toothless stuff will sell well.
Monsters, Nintendo, and of course Potter, will sell merch like crazy if done right.
And Spidey was always a top tier superhero, with an absolute landmark movie in development hell, which was a risk, but Spidey was a fantastic character to take a risk on.