SQL Server 2019 CU vs GDR update which one is correct ?

Hi all, I’m learning how to apply update for SQL Server 2019 box, current version = 15.0.4410.1 . I did my homework and used only reliable MS sources to find all updates:

15.0.4410.1 – Current

15.0.4430.1 2019 CU –most recent CU

15.0.4455.2 2019 GDR – most recent GDR

After talking to many people and seeing many source I still don’t have definite answer, some people/sources say that GDR works like CU, some say opposite.
What you would do in my case after checking all versions above, I see that GDR has higher number, so most my contacts will go with only GDR.
Both updates are about the same size. Assume I have only prod box where I need to make reliable update.

Appreciate your expert opinion.
Thanks
Mario

These all read from MS websites, what guru think about it, I suspect that in my case I still can do only one GDR,