For many CATIA V5 classic users the 3DEXPERIENCE platform is completely unknown. Definitely using CATIA in the platform has huge advantages against classic usage of CATIA and you can find all of these by searching the Internet – see for example what Dassault Systemes is saying about this subject (talking about is not the object of this article).
I know also several users asking what about their own macros, can they be migrated in 3DEXPERIENCE?
In the below gif file, you can see creation of the same 3D Part simultaneously in classic CATIAV5 and on cloud version of CATIA 3DEXPERIENCE. This was possible by modifying a CATScript from CADENAS - partcommunities