I've been playing around with both Piwik and now GA to try and produce some site wide and Faculty/Department statistics for moodle usage. I am using the Moodle Plugin 'Analytics' Maintained by Bas Brands.
With Piwik I found I was limited with the reports I could generate and distribute e.g. I wanted to compare X Category, with Y Category (Logins, Page Views etc). and distribute to chosen users in pretty graphs.
So started looking at Google Analytics, seems too much choice! What's the best way of mapping categories to do the above? would this be Filters or Content Groups or something else?