Volatile’s public servers and I am really enjoying it.
I have never been a fan of Element. While it has a ton of features, it never worked well for me and was sluggish and resource heavy which is to be expected since it is built using electron. Neochat is a matrix client from the KDE project and so it integrates well with my desktop. It implements a large part of the matrix protocol with the exception of end-to-end encryption, but most of the matrix communities that I am a part of don’t have end-to-end encryption anyway.
There are plenty of other apps that I have tried and started using after switching to KDE but these are the major ones that came to my mind.