The difference between Forth and Lisp could not be more pronounced. Forth source code has entirely implicit structure, you can't even tell which function is called on which arguments. Lisp has entirely explicit structure which makes it much easier to read and edit. Lisp needs only a single primitive (lambda) to create the entire programming language, whereas Forth needs many primitives which break the core idea of the language in order to be usable. All of what is elegant about Lisp is ultimately lacking in Forth.
I think I'd agree from a mathematical perspective that lisp is more elegant, but implementation-wise, I really do like Forth's simplicity. They're both really cool.
