HTC Desire S: Comparison
The HTC Desire S is certainly a worthy successor to the original Desire, offering a superb Android experience.
Even though we're seeing dedicated Facebook phones, such as the INQ Touch Cloud, you'd be hard pressed to find anything that does it better than HTC Sense.
The iPhone 4 is the elephant in the room, as ever. The Desire S has more built-in options, and offers widgets and other features that aren't available on iOS, but the iPhone remains a smoother web browsing phone and offers slicker interface performance overall.