Pages vs Categories

Hello, ok i building site for a certain bread of dog with wpmu and buddypress, of course i want to offer the community some info/articles on the breed but am not sure how best to achieve this!

I was going to create some pages, history, health etc etc but when i looked a petomondo site that runs buddypress they have used categories and created post in these categories.

I was wondering how others do and what are benefits and draw backs of each method?

I have read the codex on pages but am still unsure of best method, i want the info to have permanent link to it on main page.