First things first: you need to make sure our code is only on the content you're looking to track (desktop, tablet, app, etc.) otherwise we won’t be able to properly capture all traffic. We should only be on pieces of content, not your landing or channel pages.
Second thing: a 5-10% discrepancy is within the realm of normalcy. For anything higher than that, the discrepancy is usually a result of a difference in when each tool's code fires when your pages load. Please reach out to us and we’ll solve this mystery.