Grabbed the demo video that comes with the N900 to delight you and put it on the 3 phones.
The screen on the Nexus One is the most impressive.
The Droid has a 1/2 sec. lag when you try to jump to another part of the video.
If you don’t care about the screen being so vibrant N900 is just as good doing video playback comparing it with the Nexus One.