The HTC Touch Pro comes with a slide out QWERTY keyboard, a faster processor, and (the part I love the most) a larger battery. The screen size and memory remain the same on both devices.
I still hate the fact that the HTC Diamond comes with a 950 mAh battery. I think the HTC Touch Pro gives consumers a lot more bang for their buck just for the fact that it has a longer battery life and the advantage of a slide out QWERTY keyboard. And besides, the Touch Pro’s design and software all comes from the Diamond so people would have the best of both worlds.
If I had to make a choice between either the HTC Diamond or the HTC Touch Pro, I would certainly choose the Touch Pro in a blink of an eye and without any hesitation.