Dynamic serving is definitely better for SEO than having an “M.” version of your site. But it has issues. For example, dynamic serving sites are notorious for showing desktop versions to mobile users. You also need to constantly create different versions of your content for new devices that come out. If you don’t, your site may not recognize a new device… and show them a version that looks terrible on that device.nnIn short, we DON’T recommend serving dynamic versions of your pages to mobile visitors.