Hi Josh, do as done myself: learn both, Chez Scheme and Racket, you will not regret it.
For Chez Scheme there is the book of Dybvig online, along with other documentation, and for racket I suggest you "Realm of Racket".
One thing want to tell you: with chez scheme I calculate with recursion 1,000,000! (one million factorial).
Try this with chez scheme:
(define fact
(lambda (n)
(cond ((= n 0) 1)
(else (* n (fact (- n 1)))))))
Then give 1000000.
Racket will do too, but chez scheme is more fast.
A nice day for you
Francesco