I have not seen an Android hanging, to be honest. And my Nokia takes ages to respond to a request, if more than 3 apps are open. In the Android, there is no problems even if 15 apps are running at the same time, which usually does in an Android.
In the Android, you get a lot of customization options. Even instantaneous data like your CPU, processor speed, clock speed (for the techies) to know how their OS is performing and even what is eating your battery & how (for the non-techies). This is just an example. Using an Android feels classy & fun compared to the boring Symbian.