If I was to interpret that "strictly more powerful" statement, I would interpret it to be about how Racket's macro system works and what information its syntax

If I was to interpret that "strictly more powerful" statement, I would interpret it to be about how Racket's macro system works and what information its syntax objects carry. Or interpret it to mean the different languages it provides, like Typed Racket for example. On the other hand I found using multiple cores much easier in GNU Guile.