Android and WinCE are different kinds of operating systems. Android is based on a modified version of the Linux kernel and other open-source software, designed primarily for touchscreen mobile devices such as smartphones and tablets. WinCE is an operating system subfamily developed by Microsoft as part of its Windows Embedded family of products.
Android car stereo supports to install the apps whatever you want, like the media players/streaming apps (Pandora, Google Play Music, etc). PUMPKIN Android car stereo also supports phone mirroring, so you can control your phone on the car stereo.
WinCE OS can easily adapt to the hardware and it will not update any time soon. WinCE OS is relatively stable and there is little scope for problems and bugs.
The hardware of Android car stereo is often more powerful than WinCE counterparts, which makes the general cost to build is higher. That’s why the Android car stereo is often more expensive than the WinCE car stereo.