Since I wrote the earlier post our use of WordPress has grown. Most new sites are on it. And a few older ones have move over.
Reasons vary, ease of use for the end user is one, far too long for Joomal 4 to arrive is another, but a big factor is the great amount of addins especially as a lot of joomla developers have either ended joomla support or moved over
We will still wait for joomla 4 before making any longer term decision.