You cannot experience non-existence. I don't even think you understand what you mean by non-existence the way you used it in that phrase. At most you can use it as contrast to existence, which can be enjoyable or not. If your existence is the least bit enjoyable it beats not existing. at least for me, and plenty others if you ask them.

We also know not existing is desired by others with worse lived experience. Which they think that whatever it even is, not existing, must be better than their lived experience. It's basically a way to stop existing, moving into non-existence. So we can only discuss about existing.

If you have any ideas about non-existence that's cute and interesting and you should maybe write a book about it or something.

>experience of non-existing rocks.

This is not really a philosophical argument as it is misuse of logic and words. I'll let you figure out why.