I am writing this standing here, waiting for the train. It is couple degrees below zero. Stylus alllows me to keep my gloves on - I see that as a HUGE bonus.
When I was in D.C. for the inauguration last January I discovered the fatal incompatibility of iPhone's touchscreen with gloves. A stylus would have been handy.
I wonder if B's opinion would have changed had he spent a few hours with each phone trying to do some other tasks.