Yeah, Signal used to handle changing phones pretty poorly but that is sort of solved now (you can store your groups and phonebook in the cloud behind a pin). Other than that it is really nice. The desktop client is arguably better than WA's web solution, although I have run into non-syncing messages, but, you can use the desktop client with your phone off, which is a major + imho.

Honestly, Signal is just super high quality when you take into account how privacy focused it is, I could easily replace WA with Signal, apart from "the network effect".