I like iPhones, and currently own one, but I do not see any significant "new" features on the iPhone X OR 8. It's really just the Face Recognition. That's a huge price to pay for a phone ($1000+ after taxes). The only reason I am getting a new one (iPhone 8) is because I've had the 5s for years now, so it's time for an upgrade.
In regards to the privacy side of things for Face ID, Apple has a record of not handing over data to government agencies. E.g San Bernardino shooting.
Either way, if your concern is privacy, neither Apple nor Google can keep your data 100% secure online.