The obvious comparison here is to Sliders; the first Krystal restaurant was reportedly inspired by White Castle almost a century ago; which are better, but not by much. The style and taste are nearly identical; both are damn good and more fun to eat than full-sized burgers on unsteamed buns; but Krystal adds mustard, the signature sharpness of which serves as a minor distraction.
my rating : 4 of 5