One remark on Face ID and what really needs to be checked:
Windows Hello works quite similar on Microsofts Surface Pro, with all that fancy IR stuff. Now, it works really fast in the dark or with normal indoors lighting, but it does not work at all in direct sunlight.
That isn't too bad for a laptop, but for a phone I'd argue it definitely is. Hopefully someone can test this soon.
I've been an iPhone user since the first one and I really like Apple products (several different MacBooks over the years)
But I can't bring myself to justify paying almost 1200 for a 64GB iPhone X. And the 8 is no alternative. There's just not enough new stuff on the table.
My current 6s will definitely be my last iPhone.