I have both Wink and ST in my home, I use the Wink for my Pivot Power, and my GE Link bulbs. And ST for the rest of stuff, Wink has gotten a lot better, and simple robots are very easy to set up.
A lot of my more complex uses for ST revolve around motion, so I haven't really test out Wink. I don't know if it even supports any of the z-wave motion detectors.
Also, I haven't joined my monoprice door sensors to wink, so I don't know of those work yet. I'm keeping Wink as a back up currently, they just seem to have so much more energy moving forward currently than ST right now.