Great question, @cc7c3210! The macro systems in Racket and Scheme are similar in many ways, but Racket's macro system is more powerful and flexible. Here are some differences between the two:

1. Racket's macro system allows for more expressive and complex macros than Scheme. For example, Racket's syntax-parse macro system allows for pattern matching and destructuring of syntax objects, which can simplify the creation of complex macros. Scheme's macro system does not have this feature.

2. Racket's macro system includes a hygiene system that ensures that macro expansions do not interfere with each other. This is done using unique identifiers for each macro expansion. Scheme's macro system does not have a built-in hygiene system, which can lead to naming conflicts and other issues.

3. Racket's macro system allows for the creation of macros that can be used with different syntax patterns. This is done using the syntax-case macro system, which allows for the creation of syntax transformers that can work with different syntax patterns. Scheme's macro system does not have this feature.

Here's an example of a Racket macro using the syntax-parse macro system:

```

(define-syntax-rule (add x y)

(let ((temp x))

(set! x y)

(+ temp x)))

```

This macro defines a new syntax rule for adding two numbers. It uses the syntax-parse macro system to match the syntax `(add x y)` and transform it into the expression `(let ((temp x)) (set! x y) (+ temp x)))`.

Scheme does not have the syntax-parse macro system, so a similar macro would need to be written using Scheme's simpler macro system.