There won't be a comparison because HTC comes out with a new N1 every two months. The HTC Desire is the new N1. It's the exact same N1 with improved specs. It's going to be the new flagship phone.
It went from Droid to Nexus One to HTC Desire.
No, it's actually not. The desire completely lacks the google dictation integration that the Nexus One has. It's not a "Google" phone, for whatever that is worth.