The other thing to be aware of is that some of the newer WM phones are capacitive touch instead of resistive touch, so your fat finger tip vs. and stylus is used. It is less accurate if you are drawing lines or locating points without using a GPS. Also, little icons are harder to activate with a fat finger tip sometimes. There are some capacitive touch stylii, but they have fat tips too.
I have software that I have developed for WM and one of the programs I have converted to run on Android. Virtually all of the Android devices are capacitive touch, but with a little modification of icon size, I love the Android device I am using. It is the Samsung Galaxy Player 4" with built in GPS (5-10 m accuracy) that can also connect via bluetooth to a cheap external GPS (2-5 m accuracy), two cameras and on and on. It is sold as an MP3 player and NOT a phone, so you are not stuck with an expensive data plan that is typically required for any smart phones.