Instinct runs on a Brew/Java platform. There is supposed to be a lot of 3rd party development for the Instinct taht will be easy to download to the phone. I am not a big fan of Windows Mobile. Battery life is supposed to be much better on the Instinct as the phone uses a different way of operating apps and memory. My Mogul battery life sucks. Am not a heavy user but sometimes have to recharge twice a day. Other friends complain about their Mogul's battery weakness too, even with replacement batteries.
Here's an Instinct spec list:
http://developer.sprint.com/view_dev...o?device=79542
http://www.phonearena.com/htmls/Sams...ne-p_2580.html