Pocteknow has just posted a video about comparing windows mobile 6.5 and windows phone 7. windows phone 7 is the successor of windows mobile 6.5 but the operating system itself are totally different from each other.
windows mobile has so many options for customizing the phone but on the other hand windows phone 7 don’t have much options for customization. windows mobile 6.5 has issues with stability, its unstable and requires reset many times per week. windows phone 7 has a high level of stability.In Windows Mobile, an OEM could change the browser, change the interface, use a different keyboard, or include not enough RAM if they wanted to save on costs. In Windows Phone 7, OEMs cannot change the interface (beyond adding their own live tiles), they can’t change the browser, there is only one keyboard choice, and the hardware specs must follow Microsoft’s requirements.
Its hard to say to decide which operating system is best between two. because both are so different from each other. For many users who love new experiences will definitely love windows phone 7, other guys who are more content to customization old interface they will be not so much comfortable with the new windows phone 7.