My most important difference is whether Microsoft is going to stop supporting it a couple years after selling it like they did with Windows RT--leaving their customers with thousands of dollars of useless, unsupported machines.

I still can't believe they did that. Discontinuing software is one thing--you can find replacements. But discontinuing Surface RT tablets OS right after selling them is insulting and I will not be recommending them to my clients until Microsoft proves it will actually provide a long-term platform.