Samsung may have Apple beat in design from a attractiveness standpoint, but they sure have their work cut out for them in camera and performance. I'm almost positive with this OLED screen that GSMArena battery life test scores for the iPhone X are going to the best ever for the iPhone and near industry leading in (for flagship phones) in terms of battery life when the device is used for web browsing and watching video. The only thing I'm not sure about is idle time - that will depend on how much of a bigger battery they have included vs the iPhone 7+ series.
As for Samsung, as long they improve their software to perform more consistently (which they definitely have over the years), then things will get better. The area where Samsung is struggling is RAM management. My Sony Xperia Z3 Compact held more apps in storage than my S7 Edge does. Most of the time, this doesn't bother me, but sometimes it does get annoying. The Plus One 5 is probably a leader in the world of Android regarding this because of the highly optimized software and large amount of RAM. It also has very good battery life. If Samsung matched performance on the One Plus (in terms of RAM management) on top of good dual cameras, still having gorgeous hardware, and improving all aspects of their biometric security and design, I think it will be another strong phone for them.
In blind tests even the S7/S8 consistently beat out the iPhone 7/7+. Even the s7 series did. Pixel and LG G6 does as well, so I'm not sure what your on about with the camera performance.
Performance in general, yes, no one is catching apples a series chips anytime soon, Huawei may have a shot in the next few years with their kirin chips though.
As far as hardware features outside of the chip, android mfgs have been beating Apple for years. Software is a wash imo. So yeah Apple has the performance crown, but that's about it, and I don't know how long they'll even hold onto that. Huaweis new kirin 970 may already be pretty close to an a11.