I am re-optimizing some websites for a client of mine and I went to create XML sitemaps for all of the sites when I realized that each one already has a Sitemap.PHP or a Sitemap.HTML
I have always used XML sitemaps, however I could never quite get a real answer as to if it matters to Google which type of sitemap you have.
Like, is it a big deal that the websites already have these types of sitemaps instead of an XML sitemap? Is it worth changing them or does it barely make a difference?
Any educated feedback would be hugely appreciated!!!!
Thanks, - Joe.