GA4 migration for multiple websites, should I continue to use multiple property IDs as in the legacy GA?

We are currently using two legacy Google Analytics property IDs on two websites

However, we also have an app, but it is using a single Firebase ID (thus linked to another GA4 ID - GA4_1).

Now, as legacy GA will stop working in June. I have two choices

  1. Create another 2 GA4 property IDs (e.g. GA4_2, GA4_3), replace the old one (GA_1, GA_2)
  2. Re-use the existing GA4_1 from the app

Which one is better approach?



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