I was trying to be on Showngo's side. I have both myself and the Pocket PC will give a more consumer-oriented seamless experience every time.

Obviously it can't give you an xterm, access to tons of Linux goodness if you hack a little and a browsing experience that rivals desktop web browsing, but it integrates beautifully with Outlook and a host PC out of the box and there is massive quantities of good third party software for it.

The 770 is great at some things, but it's not a great PIM / calendaring device.

What you get should in my opinion depend entirely on what the focus for the use of the device will be. Both are the best choice, depending on what you're going to do with the device.