I liked Trilium but I use low end android devices and it did not like low resource devices. Same for Joplin too. If you do not have that issue, I thought Trilium Notes was very nice.

I used wallabag and liked it. I stopped when I had to move my server and backed up the data. I installed wallabag again and the backup would not work with the latest version. I had exported it in various ways as well, just in case one didn’t work well but none worked. So that left a bad taste in my mouth. This might have coincidentally happened right in a database upgrade or something inbetween the 2 versions, but the fact that my backup could not be used frustrated me. Still looking for an alternative and am considering readdeck like you. I tried it a while back and did not see a way to export data at that time (I think it could have been done from command line though?). Been over a year since then so maybe that has changed. Right now I am using Shaarli for bookmarks and it works. It doesn’t stick for me like wallabag did though.

I have tried all of them and yunohost is the best for me. I have been able to test self-hosted software that I could not otherwise. Cosmos and CasaOS work for many people, but they did not use some of the software I wanted to try; when I tried to set up a docker image of those pieces of software, it did not work. I understand that it was my failure to understand docker that failed here, so if you know docker, these might be much more useful to you.