Emile,
I have played both several times and I prefer the Fazio hands down. It is more interesting from a visual and design standpoint. I am not saying that the Nicklaus is a bad course, far from it, but I felt like I had played that course before, where as the Fazio seems more unique. Also, the Fazio has my favorite par 3 that I have ever played. The #8 Lava Tube hole is one that will make you say WOW! Play it from the back left tees and you will see what I mean.