

- Is it that some servers have better UI ?
Some offer multiple frontends so the look changes but the underlying server/content is the same. You can see some examples of them here:
https://old.crazypeople.online/
https://voyager.crazypeople.online/
https://alexandrite.crazypeople.online/
https://photon.crazypeople.online/
There are also other platforms like PieFed that interact with Lemmy pretty much seamlessly.
- How do I migrate?
You don’t necessarily have to migrate, you can just make a new account on any other server and import your profile settings like subscriptions/blocks/etc.
- Also, is it possible there are isolated federated networks of leemy (other activity protocol)?
Any instance can defederate from any of the others for any reason. While there are probably stand alone instances that don’t federate at all, most of them have chosen blacklist or whitelist federation to wall off the content they don’t want on their servers. Some of them block more aggressively and for different reasons, but there are so many at this point there’s almost certainly one that would be a good fit for you if you aren’t happy where you’re at.



If you mean you want to move the entire account to somewhere else as if it started there, you can’t. If you were to create an account on a new instance and imported your old profile data you’d save yourself the time of resubscribing to communities etc but your post history would be brand new again. You can have accounts/alts on multiple instances though and people often do. Some people keep them as backups, some swap accounts multiple times a day for whatever reason.
Using an alternative frontend is different. You login using the same credentials you already have on that instance. All that changes is the UI you’re using, everything on the backend is still the same and you are still the same person to the rest of the Fediverse.