Better Battery Life
If you are upgrading form the iPhone 7 or iPhone 6s, you will love the better battery life on the iPhone X. Apple says that you should see two hours of longer battery life on the iPhone X compared to the iPhone 7.
That's an important distinction since this phone is about the same size as the iPhone 7, that is the one Apple compares it to. If you are upgrading from a similar size device you can expect better battery life.
If you are upgrading to the iPhone X from the iPhone 7 Plus, you may see a small downtick in battery life as it is rated at slightly lower battery life for LTE browsing.
The iPhone X also supports Fast charging, allowing you to charge up to 50% in 30 minutes.