I am starting a website using Joomla and I want to find out any similarities it has with DotNetNuke (DNN) in terms of functionality. I have very good knowledge of DNN so I would appreciate it if someone could answer the following questions regarding Joomla so that I can observe differences/similarities.

"      Main Menu: We want to have a Horizontal or a Vertical Main Menu. How do we switch from a Vertical Menu to a Horizontal one?
"      Sub Menu: We want the SubMenu to work when you rollover a mouse over and not when you click on a Menu item
"      Multiple Languages: User should be able to switch to a different language by using a single button. Is their a way where duplicate pages are created automatically for 2 different languages? How do you
"      Speed: We want to make sure that the speed of the site is much faster using Joomla rather than using DNN
"      Add pages: How do you add pages?
"      Add Text modules: How do you add text modules?
"      Updating Content: Is updating Content done faster with Joomla rather than updating with DNN?
"      Register users: Option for registering users?
"      Account Login: Option for user login?
"      Banners: Is it easy to add banners?
"      Documents: Is it easy to add documents?
"      Events: Is it easy to add events?
"      FAQ: Is it easy to add a FAQ module/page?
"      Links: Is it easy to add a Links module/page
"      Users/Roles: How to you add users?
"      Roles: Can you add roles and how do you give them the appropriate roles to specific users?
"      Permissions: Can you select which pages can be viewed/edited by specific users i.e. Administrators, All users, Registered Users, Subscribers, Unauthenticated Users or specific Registered users?
"      Uploading Files: Can you upload files through the website and through ftp?
"      Max File Size: What is the maximum size file you can upload on website?
"      Templates/Skins: Can you upload new templates and skins on website for Admin to select? Does Admin have option to select different templates and skins for different pages or different text modules?
"      Page Containers: Can you upload new page containers on website for Admin to select? Does Admin have option to select different page containers for different pages or different text modules?
"      Date Settings: Can Admin select start and end date for a page to show?
"      Copy Design: Can you copy the design of a page to other pages e.g. descendant pages?
"      Copy Permissions: Can you copy the permissions of a page to other pages e.g. descendant pages?
"      Newsletters: Is there an option to send Newsletters to users?

1)      Is it easy to upgrade to a new version of Joomla in the future? (we are hosting in GoDaddy)
2)      More importantly, what is there in DNN in terms of functionality that Joomla does not have it?

Thanks,
Chris