Both are smart phones designed for users who want easier access to the Web than is offered by the current generation of RIM (RIMM) BlackBerries.
They share a lot of features — high res (320 x 480 pixel) color displays, motion sensors, support for GPS and Bluetooth 2.0, and venues for third-party apps. And they share some of the same flaws — lack of video recording capability and full cut-and-paste text editing, to name just two.