I use Summit on mobile because the dev included all my feature requests, so it's an app built for me, at least for the features I use. They're a very active developer, and it will hopefully stick around for a long time. On a real computer, I just use the plain website. I do most of my stuff on mobile so I can save drafts. I prep most of my posts ahead of time and I tend to write long things.
I've stuck with lemmy.world because they're big. I don't want my stuff to just up and disappear one day. I've got a lot invested here, content wise, and the .world admin have been really nice to me in the handful of times I've interacted with them and they've supported me in my real life activities pertaining to wildlife.
I'm primarily here to post owl related educational content and animal rehab stories. It started out of curiosity and now thanks to regularly posting here, I became a rehab volunteer last year.
I'll also post to news and politics posts if I feel I have something useful to add, but with world events getting worse, those communities get a bit too angry sometimes and I stay out.
When I don't have owl questions to answer, I scroll by Top 6 Hours so there's a chance people will still reply to my comments. I ignore the ragebait and find I still get juuuust enough content I don't feel oversaturated.