The Duo is definitely compelling (and honestly I really, really like the animation when opening/closing it) but price point aside I just don't think I can go without Face ID at this point, even with unlock via watch as an option.
I know this is "more money than sense" talking but I might trade in my 17 Pro for an 18 Pro just for the black colour, which is really the one I wanted last year but didn't get. I'm also hopeful the C2 modem will help with some poor coverage spots around me, as apparently the C1X does handle those better.