Right way for making App Pro version in Xcode

Question

Well, we have got a simple application, and now we decide to make Pro version. Otherwise, it will have approximately 30% of changes of code and UI. My question is simply - how make this right way?

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I've got two ideas:

I could create additional project scheme and set up environment for it with preproccessing, configured assets catalog, included new files, etc.

Or I could create new project inherited from this one and support it separately.

Both approaches has advantages and disadvantages. So I ask experienced people, what is the right way to create new Pro version and support both. Please, pay attention to level of changes. Thank you in advance.