The only differences are the Bereaver and the Solus Greatsword. On the PC version, the Bereaver has one augmentation slot, which is filled with a flame augmentation, and the Solus Greatsword has three augmentation slots, which are filled with a flame, a health, and a sharpening augmentation. On the Xbox version, the Bereaver has three augmentation slots, one of which is filled with a health augmentation while the other two remain empty, and the Solus Greatsword is the same except it has an empty augmentation slot instead of one filled with a health augmentation.
Other than that, the only difference is the overall feel of the game while playing it, which is just personal preference. To me, the Xbox version feels weird. I prefer it on PC.