Differences among operating systems as identified by name and version are very important.
My original specification was a small, but my response to you makes a larger point.
iPadOS did not (publicly) exist prior to yesterday. Before its release, iPadOS was definitively not “then still called iOS”. Up until its release, iPadOS did not exist (publicly).
Your last comment is confusing given we're discussing, specifically, iOS and iPadOS, not Windows. Further, I have no idea what any of this has to do with "better". I was very specifically focused on OS differences as identified by names and version numbers.
To be clear, iPadOS is not the same as "iOS 13 for iPad", whatever that might mean. iPadOS comes chronologically after iOS 12 but that's about it.
iPadOS has distinct code, features, and APIs not available on iOS. Period.
Saying iPadOS is "iOS 13 for iPad" makes no sense except in the most superficial sense that it comes chronologically after iOS 12.
Do you mean mean an iOS update? iPadOS was not released until today, 24 Sep 2019.