I'd love to win the 950XL specifically, as it has numerous slight advantages, in my opinion, over the 950 (i.e. faster processor with liquid cooling tech, larger battery capacity, larger screen).
The 950 series, in general, has a multitude of reasons why I would purchase one of these phones over any other phone on the market right now: Windows 10 OS, fantastic camera (best in the smartphone market), Continuum, Windows Hello, universal apps, high-end audio, expandable memory up to 2TB (eventually), etc.
I want Windows Mobile to succeed; I want to try to turn others on to this platform. This is the phone that will not only get done what I need done from a personal standpoint, but will also allow me to showcase to my friends/family that Windows Mobile is a great - no, THE - alternative to iOS and Android.