Let's face it, windows is ok for pc's, but you can't beat bespoke HMI's if you do not need SCADA type packages, CE is slow, too much functionality for simple HMI's so most of the overhead is a waste, I have used both panelview & siemens, they are slower, fall over more often.
The bespoke ones like the old panelviews, E terminals, Omron etc. seem more robust but sometimes lack functionality.
But I still prefer them.
On site we have somewhere in the region of 40+ Beijers, Panelview & Omron NT terminals, these give little trouble apart from the odd water soaking or physical abuse, whereas we have also a number of siemens & panelview+, these in comparison break down/lock up far more often.
the choice is yours...