While SADX offers more content, many fans argue it lost the original's "soul" in the transition.
The "DX" (Deluxe) tag brought a significant amount of content that wasn't present in the 1998 original:
Updates the pet-raising system to align more closely with the mechanics found in Sonic Adventure 2: Battle . The Technical Trade-Off
Includes 12 emulated titles, such as Sonic Chaos and Sonic Labyrinth , which were previously difficult to find outside of the handheld.