The issue between Mambo and Joomla goes deeper then most of you are thinking.
The reason the core team left the Mambo project is because Miro wanted to control the path of Mambo development. Which goes against the principles of
Open Source software by not giving the community any say on where they wan't the project to go.
So with the current path of Mambo it will be you get what they give you. With Joomla it will be more you get what you ask for.