
Fedi is in the middle. Nostr is also in the middle since it uses relays, but it leans more toward the right due to decentralized identity (though that changes just a bit with NIP-05 verification, bringing it closer to the middle again).
Nostr started out trying to be more decentralized than federated, but it's creeping gradually toward being a federated network. Right now the nodes are more-or-less the same, but as time goes on, relay operators will start "tailoring" what is and isn't allowed to go through their relays and which relays they do/don't talk with, etc.