I use it and love it, but still think the logo is a bit weird, reminds me of some evil message you see after a virus crashed your PC 😁.

Not sure about the self-host part but Jabref and Zotero might fit.

What are the reasons for the Pi Hole to Adguatd switch?

It’s trillan you are talking about. I am old too :D

Using Argon NEO and quite like it. In my case it was important to have the ability to use a HAT (HiFiBerry).