I have both, but I have to return one to Verizon.
The Droid X has better hardware hands down, but software, the Dinc wins with Sense UI.
But I hear the X is supposedly getting Gingerbread and the new Motoblur, which I think is a good competitor to Sense. I would stick with the X if I KNEW it would be getting the new MotoBlur and Gingerbread. That locked bootloader has me kinda iffy, but like I said, if I can get a half-decent UI, I don't really care.
So anyone know about this OTA Gingerbread update for the Droid X? I heard "soon" a month ago...