I’m on Sakurajima.social because it was partered with the small anime-oriented masto instance I used previously so it felt like an easy swap and i could trust the moderation policy but my advice is, if you wanna use it like mastodon find a small instance where you can trust the mods and talk to them, and if you want to use it like its own platform (using channels, namely) find the biggest instance that’s catered towards the niche you’re most passionate about. Channels are a big feature sell of firefish for me so being on an anime-centric instance makes a lot of sense for me :)