VPN or private DNS or privacy ISP?

I did search different forums, but could not find sufficient answers to my questions below.

I live in an eyes country in Europe.
I have a privacy respecting ISP (actually true), as far as the law lets them.
Today I have Mullvad together with a private DNS via nextdns.

  1. On Protons website, they claim that a separate DNS provider when you use a VPN is redundant. But I see alot of people here who use it. There should be a clear winner here, but I can’t seem to find an answer to it. Is a separate private DNS redundant when using a VPN ? Or does it just make you stand out more?

  2. I trust my ISP, that they are not snooping, and that they hand out data, when there is legal ground for it. Would you use a VPN anyway, or would you just use a private DNS? The main reason for using a VPN is to hide from your ISP right?

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