I love that a Twitter founder founded Bluesky and the logo went from the outline of a white bird on a blue background to the outline of a white butterfly on a similar shade of blue background.
I'd say mastodon is a better choice, mostly so that you're not beholden to yet another profit-focused tech corporation. I'm sure Bluesky is fine right now, but once they have their userbase they will shift to monetization - and you may regret letting yourself become entrenched in the world they control. They're not doing it for your benefit.
That said, I've come to understand that a lot of people kind of like having their content feed controlled by others. When they only see what they ask for, they get bored. So I'm expecting Bluesky to always be bigger than Mastodon.
I run a few bots on Bluesky and absently check it occasionally on a personal account. Anecdotally I can say that I'm seeing a lot more engagement even just over the last week.
I'm on Bluesky. I have seen a drama increase in followers in the last few days since Twitter let blocked people see content that were blocked from.
It's a big blow to Twitter that people are finding someplace, anyplace , else to go.
I had to decide if I was going to Mastodon or Bluesky. I picked Bluesky because after reading Mastodon's integration problems with itself I wanted nothing to do with it. It couldn't scale unless each instance played nice and in the years since it went live they had refused to do that and showed no signs of even moving in that direction.
I remember putting in so much effort into my MySpace page… and then it was replaced by Facebook… and I had to start over. That’s the only reason why people are staying in the shitter…