This is a really simple question of preference, but when tagging:
For communities, are you more partial to !community or /c/community?
For usernames, do you like @user or /u/user more?
For me, I prefer the former (! and @) because it feels quicker to write them that way and it helps me create mental separation between the Beehaw/Lemmy way vs. the Reddit way. Also, when linking, I like the more instance-agnostic link styles [!community](/c/community@instance.com) or [@user](/u/user@instance.com), even though it takes a bit of effort to write.
If the UI would auto search for the community/user and show a loading indicator of sorts, I’d be partial to the
[!community]/c/communityformat (as opposed to the 404 if the community/user isn’t yet known to your instance). That would be instance agnostic and provide a natural flow.Since that’s not the case, I currently prefer the
!community@instance.comstyle.