And you know this how? The X isn't even out yet or tested. What is out currently is what I am discussing and what we know.
I am far from an Android fan. My Note 8 is my favorite Android. But I have had iPhones since the 3G. My last was my 7 plus. I have actually hated Android till recently after I saw how well it has become. The point is, anytime Apple Fanboys lose they cry and make up excuses. It is a good phone, but it isn't the best phone. Apple has lost it's way in design period. The X will not sell well at that price period.
Android gets timely o/s updates every month and has face recognition that works unlike Apples that failed.
And you know this sales performance how? (Hey, turnabout is fair play.) It hasn't gone on sale yet. Given that the consensus is that many enthusiasts are waiting for the iPhone X, it's entirely likely that it'll sell as well as supplies allow.
I know the iPhone X's cameras will be more competitive due to simple physics. A wider aperture on the second camera means it absorbs more light, so low-light performance will be better; adding OIS to that camera will improve its sharpness in virtually all situations, and should reduce noise even in moderately well-lit scenes. Whether or not it's better than the Note 8 is hard to say, but it will be better than the iPhone 8 Plus.
Also, I have to be blunt: you're getting some technical claims straight-up wrong.
Android gets monthly security updates, and only some devices actually receive them on a monthly basis. What I'm referring to are updates that improve functionality... you know, upgrades, not fixes. Yeah, if you have a recent Pixel or Nexus you didn't have to wait too long to get Oreo, but what if you have an S8 or Note 8? Hope you don't mind getting Oreo by the time you're hearing about the Galaxy S9.
And sorry, but Apple's face recognition does work. You clearly didn't pay attention to the story beyond the initial headlines. You know what caused that problem on stage? Enough people had stared at the phone that it triggered the "you need to enter your passcode" failsafe. In other words, it worked exactly as it was supposed to. Plus, it's a bit rich to brag about face recognition "that works" when Samsung's can be fooled by a photo. You need to use the iris scanner for a vaguely secure option, and it's still more vulnerable than Face ID.
Look, you say you're "far from an Android fan," but that's not how you're behaving. You're clearly riding on that high of not only getting a brand new phone, but of switching and experiencing a platform you hadn't touched for years. You feel you have to defend Android and the Note 8 at all costs because the switch was a very important decision to you. I'm not asking you to return your Note! What I am saying is that even a Note 8 isn't going to be the best at everything, and that the iPhone X is likely to be just dandy as a phone (even given its price), particularly for people who have no inclination toward Android or Samsung devices.
For context: I've used multiple mobile platforms regularly. An iPhone is my daily driver, but I regularly use Android and even dabble in Windows phones. And you know what? That kind of constant contact changes your perspective. Instead of feeling like you have to cheerlead for the only platform you use, you realize that it's okay for other platforms to have advantages so long as the one you use happens to work well for you. Basically, I'm telling you to breathe. Relax. It's a phone; Samsung will not be in trouble if you don't go to bat for it at every opportunity.