Chez is a scheme, whereas Racket is basically a scheme but was renamed from PLT-Scheme because the authors/community felt it had strayed far enough from scheme

Chez is a scheme, whereas Racket is basically a scheme but was renamed from PLT-Scheme because the authors/community felt it had strayed far enough from scheme that a renaming was a good idea. It's still basically scheme though. I mean, if you're coming from a scheme background the only thing that might trip you up in racket is cons cells are immutable. If you only have racket experience and try out [another] scheme, you might experience some culture shock when you start encountering stuff like let-values being in srfi-11 instead of racket/base. In my opinion, racket is generally a more pleasant experience. Virtually all of my personal/recreational projects are in racket these days.