What to choose for better SEO-WP blogs or VB blogs?

Hi all,
I have a VB suite license.
If I want blogs for my users I can get it done via VB blogs or wordpress blogs.
Now,I am sure that most of you will agree that WordPress is the best blogging tool in terms of SEO.
In order to choose between wordpress or vbulletin blog,I
need to know something from you all.

01.In order to enable my users to have their own blog ,I will have to enable multi-site feature of wordpress.Have you seen this done anywhere?If you haven't seen then is is possible to do or not?

02.Does vbSEO works for vbulletin blogs and makes it better in anyway??

If vbSEO enhances the SEO of vbulletin blog,then I am sure to use VB blog due to out of the box integration.Otherwise I would like to use wordpress for blogs by my users.
Suggestions needed please.
Thanks

I think wordpress can create you some security problems i would prefer vbulletin own product for this reason.

02. Yes vbseo words perfectly for vbulletin blogs.

vBSEO has full vB blog support.

Wordpress is a better single blog solution. But going forward and for ease of maintence, using the built in blogs for multiple users is the easier to future proof choice.

Thanks.Just a short question here.
How does vbSEO improves the SEO of vb Blogs ??

It works the same way as it does on threads.

It provides a single url to one resource, and all the other blog urls there-in, plus all the other code enhancements like white space clean up, analytics code integration, and the 100+ other features that we support.