So, here's what it comes down to. The Windows tablet approach will have lower development costs, but there is a company willing to do a pilot by loaning us 3 free android tablets. Free is nice.
For Windows Tablets, here's what we would want, secure (of course), locked down to only supported apps, and remotely wipable. Other than that, rugeddeized which almost any tablet can be, wireless, which any tablet can be, and larger screen, which windows tablets seem to have.