The lower level ColorChecker Classic is around $59 USD, Datacolor Spyder comparable one is also around $50... meanwhile there's some DKG Tools for only $25.
Current on B&H:
So the X-Rite and Spyder low levels are both 24 while the DKG is 18. But from a quality and color accuracy point of view is there a difference between the 3? Do any of them last longer in terms of color degradation? The one I hear about the most is the X-Rite ColorChecker Passport which isn't terrible at $100, but then I'm not sure if the additional colors and name recognition are valuable or just marketing ploy.