vBulletin with Joomla?

[Fusion2]

I have vBulletin and i am going to be installed Joomla.

A few tech questions:

1. If i plan to integrate the two, do i use the same mysql database or seperate database?

2. What is a good software that connects the two of them together?

3. When a user registers do they register on joomla or vbulletin side?

4. Would there be a single set of permissions that integrates them together?

5. Is there a better choice then Joomla?

Basically i have the web forum and now i want a magazine style articleson my html website. So i was looking at using Joomla to do this. But, if there is a better option, please let me know other than doing normal html stuff.