Landing page for menu items be pages or categories?

Hi,

I’ve recently started working on a site using executive pro theme. I have 4 main menu items (a,b,c,d) and want the landing page of each element to simply be a description of the item. On the left hand side of each landing page I want to display the appropriate category. Example: Click link to menu item a, land at landing page with description, left hand side shows a category with content corresponding to a. Same goes for b,c,d. Each menu item has it’s own specific category to be displayed.

4 Menu items.
4 Categories.

With that being said, should the landing page be a “page” and somehow link to it’s specific category, or should the landing page be the base category page and somehow not display it’s corresponding posts.

What’s the proper way of handling this?

Thanks,
Nathan