The 2 will vary if you compare lets say link report.(they wont appear to match exactly).
The Activity Map Page report then broken down by links will be most accurate to match against browser.
When it comes to links in a dropdown many of them will appear as hidden in your browser output. The issue of QAing is quite easy to check if you like. You need to use your browser debugger to see if activity map link is present on subsequent page load.
Try one of your menu links, see beacon output on next page to see if it indeed is firing as expected.
Some server setups like angular may not pass all links you have on page when clicked.