WmPowerUser’s article, named like this post, has a table comparing these two leading phones.
The most obvious difference is the HD2’s screen is 4.3” vs. the Nexus One’s 3.7”. Despite this substantial difference in screen size, the two devices are very similar in height and thickness, the only meaningful difference being width:
In the USA, both devices are going initially to T-Mobile USA, though Verizon will get a CDMA version of the Nexus One this Spring.
I really like the HD2. However, it doesn’t appear to be going to either of my carriers, Verizon or AT&T 🙁 Perhaps I can buy unlocked an HD2 variant heading for South America to a carrier that has the same 3G bands as AT&T. A long shot though. Otherwise, I need to decide whether to sign up with TMo to get the HD2.
I like the Nexus One, not as much as the HD2, but enough that I am glad I decided to hold out and not spring for the Motorola Droid. The Nexus One likely will replace my Blackberry Storm on Verizon unless something better comes along to Verizon in the meantime.