I wonder why people start comparing something they didn't even see in real. Just wait for some real good reviews of the Nexus One. And I am surely going to do so to see how it supports all Google applications where most of them are pre-installed.
Android One phones and Nexus phones are the only ones in the market with
a guarantee that they will receive all latest OS upgrades from Google directly. This makes them special.
Watch out for latest android one phone launching soon by Lava Mobiles!