I just came from winmo 6.5 (Tilt 2). It was really quite awful.
I would be hesitant to switch back to winmo.
My experience with Android has been great. I read so many threads bad mouthing the Captivate, that I have to wonder if people have a different phone than I do. My Captivate is FAST, responsive, and reliable. I only have to reboot because I WANT to, but rarely because I have to. With winmo I had to constantly reset, several times a day, due to freezing etc.
The only thing I will acknowledge as a problem with the Captivate is the GPS. I can live with this, since I have a GPS unit in my car. Other than that I love the Captivate, and Android.
I see how quickly Android is evolving, and it is impressive. Winmo took years to make baby steps. Between WM 6, to 6.1, to 6.5 I had 3 phones (in 3 years). The difference in the OSes were minimal. Still the same lags, still the same freezing etc...
My boyfriend has an Android phone which had 1.5 (Samsung Moment), and the improvements since that phone (in about a year) are astounding. I can only dream of what the Android future hold
I think I'll stick with Android
