I am a proud Moment owner i will say that the slide is not cheap(rare find in a slider phone) only problem i will admit to really is Samsung itself..HTC has a better Google backing and a much larger development comunity. I will say that we are growing but not sure if we will ever get Samsungs required cooperation. that being said. the screen is freaking beautiful, decent camera, the flash is very bright (even can be used as an awesome flashlight) the keyboard is intuitive once you aclimate to it. My best advice is to hit a Sprint store and play with both phones scour this forum,
Samsung moment forums,
SDX-Developers, and the XDA forums (predominately for HTC phones) wish you luck with your search for yuour next phone and hope ive helped.
*I will admit im a little biased toward the Moment since im a mod over there at SMF*
dale