Zap looks like a continuation of Hubzilla.
The technology of Zap is ahead of everything else. Zot is definitely better than anything on the fediverse. But where it falls behind is user interface design at an obsessive level of attention to detail. How many clicks does it take to do the most common things? Are there icons for the most common operations? Are related things visually grouped together? Stuff like that.
Currently finding other users to connect to is non-obvious, and that should be part of the initial process when you first create an account or channel.