If we are going by sales and revenue alone, the iPhone is clearly the best phone out there.
Samsung vs. Apple in smartphone revenue: CHART - Business Insider
Comparing the Note8/8+ to the V30, I have no doubt that the Samsungs will outsell LG devices. Many consumers equate Samsung with Android in general, and it takes time to establish that kind of brand recognition, and LG has made some serious mistakes in recent years in that regard.
I know that the fingerprint scanner is a complaint by almost every reviewer out there on the recent Samsung flagships. If LG gets the camera right (looks like the hardware is there), I think that most reviewers will say that the V30 is the way to go for a large phone (unless of course the stylus is required).
I'm a large screen phone fan, and the V30 has me looking, and I'm no LG fanboy. This forum is not a place where your typical consumer hangs out. The V30 with the glass build and amoled will have regular consumers looking at it in stores, mark my words. While things like wireless charging and DACs will help here and there, large screen fans will be taking a close look at the V30, and unless reliability becomes an issue again, it could mark the beginning of an increase in market for LG.