I am using the following:
Developed a WPF application for Windows.
Panasonic Toughbook CF-52
Panasonic U1
Trimble Yuma
2 Desktops (Dell)
But the Panasonic U1 and Trimble Yuma are too slow when using ArcGIS Mobile. It is laggy and user complained a lot about the slowness.
We may get newer tablets in the future, going to stick to Windows as the OS since that is how we have developed our application.