The build (thanks to the stainless steel) is better on my iPhone X. I like the dual cameras, app selection and quality, all the iCloud apps and the way they integrate with my MacBook, iPad, and airpods. Love the "no bezel" look, and face id (with integration in 3rd party apps), and the gesture bar. iMessage and FaceTime.What are some pros & cons between the s9 and X?
Cons are lack of customizations, I like Android UI better, and the walled garden means some apps aren't available.
The S9, I love the customizations, I like the Android UI better, Samsung hardware features (microsd card, headphone jack), Samsung pay is much better than Apple pay, faster charging (both wireless and wired), the fingerprint sensor and gestures, and the price was much better.
Cons are software isn't quite as polished (both 3rd party and 1st), and curved screen.
Those are the difference for me, other things such as performance, screen, battery, camera, ect. are basically close enough to each other, it's a none factor.