I use both a Core and Fuse
Core is great for throwing big sweeping anny's, straight shots, or start on a hyzer and you can get fade out of it.
Fuse is great for shots that go straight with a bit of turn at the end, a small hyzer flip for dead straight, or again a lot of hyzer for minimal fade at the end.
I think there both versatile and you should own both of them. Also good for form correction as other's have stated. If I'm having a bad day I can't throw the core at all. I've noticed this with all Lat64 discs though. They are very sensitive to nose angles and OAT.