krsty

What about ‘Custom post type’, can I use them for my project?
If I decide to use only categories for this website, then I need to group all my post in parent categories and then use sub-category as main categories?

The main reason to use MultiSite is to separate posts in multiple tables wp_{id_blog}_posts , and don’t overload wp_posts wich will slow my website. I post over 10-15 posts daily.
Also, if I will use only categories, I will have limited control over ‘sub-blogs’ and I think that with WP Multiste I will have much better control.