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Well, 1903 is fine for many who have installed it- you can read many people's experiences in the News item on 1903, for example- pages of them.
How to get the Windows 10 May 2019 Update version 1903
More if you read the comments in the thread per 1903 update released subsequently,
Further, when a major build is released, typically you might best wait another month or so til the first major update is released - for the flak to die down. That's where 1903 is, and then some.
So consider when you might get 1909, if you were to wait for that:
Now 1903 was released 21st May, but delivered slowly via Windows Update. Allow another month to the first update - that's June. Add 6 months, and you may be waiting for 1909 until mid December.