The "Original Designer's Edition" is has a more impressive sculpt. The head is the biggest change. The original helmet had more of an egg shape while the new one is more dynamic where the snout meets the forehead. There's also some shinier gold and silver paint used throughout the figure. The claws are also chrome now instead of a dull grey.
Basically just a bunch of minor improvements over the original Wargreymon figure but nothing major.
the claws were always chrome