Both are suitable for scientific text, but the two types of editing are very different. Language editing focuses on spelling, grammar and phrasing. With scientific editing, we do whatever we can to help you express your specialized scientific ideas for your target audience.
The choice between these services depends on what you want us to do. If you want help with your English, choose language editing. If you would like broader and more intensive help with communicating your research, choose scientific editing. For more information, please go to Language Editing and Scientific Editing.