Sibling comment already asked the important question to ask yourself, but my answer would be: Language design decisions and the typical benefits of using Scheme dialects or former Scheme dialects, as Racket does not consider itself a Scheme any longer, iirc.

For example being able to make good use of recursion, being able to write programs more elegantly.

Racket, in contrast to JS or TS, comes with lots of batteries included, therefore not requiring so many third party dependencies. Time and time again I see the Racket docs and think: "Ah Racket has got something for that/got you covered." Also it is rich in programming language concepts. You can write your programm in any of the languages that come with Racket, or you can write it with function contracts or you can use Typed Racket.

At its core, it is a much cleaner and better designed language than TS will ever be due to TS' JS legacy.