Gutenberg works well with themes and plugins, while Elementor is essentially designed to not need other themes or plugins. Gutenberg is primarily a block editor, while Elementor is a page builder. The difference is that Gutenberg lets you add and rearrange blocks to your website, which is then controlled by your theme.

If you want to sacrifice your page speed for more functionality, then you should choose Elementor. Otherwise, Gutenberg works pretty fine for any website. However, if you prefer a more straightforward layout design, Gutenberg will be your primary choice. But you will have to use only the default features