Face ID works miraculously for me. I was very surprised. My 6S Plus's Touch ID, for me, didn't work quite well. It worked 70% of the time and I had to type my passcode the rest of the time. I think Face ID failed once in the last five days, since I got the device. Again emphasis on the 'for me' part. I don't know if this reflects the whole, but Face ID is significantly better compared to Touch ID.