At this point it's been a while since I don't use a mail client, last time Evolution sorted my need of Activesync compatibility and I used it extensively. But these days I no longer need that, as I'm planning to use just protonmail and maybe also sync gmail to it (although for gmail I kinda prefer the web). Reading through the comments on the app I saw mentions about Betterbird...What's your thoughts on this?
I wish I remembered more details but the consensus seemed to be to stick with Thunderbird. I use it every day and the new v115 really made it feel new again.
115 made Thunderbird UI more customizable and consistent. The idea was to get rid of some of the cruft which accumulated over the last 10 years and make development easier.
But they'll add features like Thunderbird Sync to share settings between different devices, like the upcoming Thunderbird Android (K9-Mail).