We are planning to upgrade SDL Web 8.5 to SDL Tridion Sites. I am looking difference between SDL Tridion Sites and SDL Tridion Docs 13.
SDL Tridion Sites 9 will be the successor of SDL Web 8.5, which is a Web Content Management (WCM) solution, but it is not released yet.
SDL Tridion Docs 13, is a DITA-based structured content management solution, which was formerly SDL Knowledge Center.
SDL Tridion Sites and Docs are part of the SDL Tridion DX suite.
You have tagged your question with sdl-cloud, so maybe your question is referring to that, but I think it makes sense that you edit your question and provide a bit more detail around the why of your question. Why are you planning to upgrade from Web 8.5 to Sites exactly, what is the driver behind this?