ODIS vs. VCDS

Hi Leutz, today a question about diagnostic software. Time and again you come across the term ODIS as a VCDS alternative in various forums, also here. Since I also have access to various software sources because of my interests, I am about to land the current ODIS as of April 2021. With 17 GB this is already a different house number than the VCDS, so should also be more “drin”. So what leads me now to the actual core of the question. What can you do with ODIS? or are there complete repair guides for all types of VAGs, or spare parts catalogs, or, or, or, or…? Does it need special hardware… etc. etc. etc. Would be nice if you could help me a little bit. Manny thx 4 hlp Ralle