I've been considering all three of these phones as well, but have decided to hold off for now as I have the latest version of Jelly Bean running on my old original Galaxy S which has breathed new life into it. I do think one downside of the HTC One is the lack of a SD card slot.
I also find it amusing though that some people are saying they would not even consider these three phones, seeing that they are the current top of the line phones spec and feature wise. The HTC One even uses an aluminum unibody, so one can't complain about a cheap feel with that phone. Unless someone is so deeply entrenched in the Apple ecosystem, I don't see why they would not take a look at these phones.
Delivered in Munich, broken in on the Nurburgring.