I can tell you from experience, it does not compare to the Dash or any other WM smartphone even the slightest bit. I got the dash before my curve, because I had a blackjack and the dash was horrible. The battery didn't even last me a day! So I took it back, and got my curve. I couldn't be happier!
BB is much better then WM... I had the dash and I actually really like the phone.. the formfactor is amazing and I prefer the slim fit of it over my curve.. but there is no competition when it comes to the OS.. WM is inferior to the BB OS.
the only advantage of WM over the BB os is that there are sooooo many more free apps available.
The Curve is FAR better than the Dash...I hade a Dash before I got my Curve and you couldn't pay me to go back to it...it froze up all the time, then when I gave it to my sister, it would just randomly shut itself off (sometimes while in the middle of a call)...she eventually got a Curve and gave it back. It now occupies a nightstand drawer.
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