The software are the same. Only thing it's when you connect VCI J2534 the software recognize your VCI and in some brands in programming you have other options. In diagnostic you have same options if work with PRO or not.
Is much better to have VCI J2534 that the normal VCI, because if there isn't that option in Maxisys you can go to OEM website.
Example: In BMW, Mini or Rolls Royce, with only 6€ you can do diagnostic, programming and coding, see technical information in OEM website by connecting VCI PRO. Do you imagine that? That is very very good. And I already try it.
In this way you are working like an official dealer!