Now that I have a fat bike, I rarely ride my Giant Anthem X.
I really enjoy the additional traction, supple ride of those fat tires and stability over loose rocks. I find that I can climb hills on the fat bike that I seldom make on the Giant.
If I spin out on the Giant, I hike the bike but often, if I spin out on my Framed Minnesota 3.0, I can usually get a second chance at a regrip because it doesn't spin out as fast.
Add to that, an extended riding season, higher degree of safety and the looks you get (and good conversation), it's no wonder that my fat bike is now my "go to" bike