I actually just switched from the iPhone X to the Note 8 last week. I strongly disliked the Face ID technology and found it to not work consistently enough for my liking. As someone else mentioned, it did not work at all when I would lay in bed and try to unlock it and I also had issues unlocking it while I was driving to change music on Spotify and such. I felt a little misled by the screen size as well coming from the 7+ (although that's my fault for blindly ordering it and not looking at the specs closer).
So far, I'm really enjoying my Note 8. Screen size is expansive and exactly what I want in a phone. Having had a Note 3 way back in the day, I found myself really missing the S-Pen and I use it all the time now that I have it back. I do really miss iMessage, especially as I work in a building with no cell signal and MMS messages don't seem to work over Wifi like SMS. It was nice to have seamless integration with iMessage and SMS/MMS in one app. Other than that, I really don't find myself missing much at all. This is coming from someone who has a Macbook, two Apple TVs, an iPad mini, and an Apple Watch (which was replaced with a Gear S3 Classic).