Solved
Activity Location vs. Site Pages Audience
When creating an Activity, is there any difference in targeting URLs based on an Audience (using Site Pages - Current Page) vs. specifying the URLs in the Activity Location?
I think a bit more information would be needed to help solve your problem. Your activity location field should be some key that you come up. They were formerly known as mbox names. I haven't seen any implementation with the location name being the url string. I would rely on the entry audience for looking at page params.