On twitter, you're still stuck in a bubble -- only, one created by ranking based on projected interaction. (Functionally, this means an angry bubble: you see only things Twitter thinks will drag you into a flamewar.)
On the fediverse, you set your own filters and pick your own followers, see things in unadulterated reverse-chronological order, and nobody's pushing promoted posts on you.
(Ultimately, this comes down to having a non-profit-oriented, non-centralized system, favoring multiple independent identities. And, it's a throwback to the pre-eternal-september era of usenet, where you went online to have reasonable discussions and added people who annoyed you to your killfile.)