My profile in case you want to follow: https://bsky.app/profile/xeiaso.net
Last year, I seriously started using Bluesky. It's okay, but a little too much like "old Twitter" for my tastes. I still use it, but my most interesting posts go on Fedi.
This is all to say, Bluesky has replaced Twitter for me, but I was already phasing it out.
On Mastadon I find much smaller circles, but much more engaged.
I think bluesky is winning at discovery. If I want to feel the pulse on a topic, bluesky is winning. If I'm not even aware there's a topic that I want to feel the pulse on, bluesky is winning. But I think mastadon has been successful at curating a very different 'vibe', and I appreciate it. So I catch up on mastadon first, and then doomscroll bluesky if I need to find work for idle hands.