Build quality, motorola by a mile. The lack of plastic, the partnership with the NFL, state troopers, police and fire....yeah I think htc could be argued best manufacture for android (I voted that) but taking in the big picture of what the manufacture does, motorola has done more for this country, the military, and law enforcement than htc could dream of. Question, situational I suppose.
Even though I have the 1st Gen Moto Droid, I have to say HTC has been the most impressive across the board. They've made the most Android phones out of any other manufacturer and have made quite the footprint in the industry.