I know that the topic of whether to use underscores in titles versus hyphens has been debated before, but my question is specifically this: Has anyone switched their pages with underscores to hyphens and had better position in the serps (especially google)? I have many older pages and wondering if it is worth the effort to change hundreds of pages over to hyphens. Thanks.
Well it depends on what keywords you are optimizing your website. If the keyword is blue widgets then use blue_widget and if you want to target two different keywords then use blue-widgets. Make sure that hyphens means you are separating the words and underscores means one word.