I first wanted to buy the desire. Then I changed my mind and wanted to buy the nexus 1, since it can get new firmware earlier and might be able to update to more future firmwares.

In the end I decided to go back to the desire for few reasons:
1 Sense UI
2 Warranty for 2 years, service locally
3 Optical trackball not so easy to get dirty and spoil (I never seem to use it now btw)
4 Can always root and update to newer firmware after warranty expired (I hope )

Just before I bought it the Samsung Galaxy S also launched. But Samsung always seems to be very slow with updating the firmware (even slower then HTC!) I also heard it can run very slow. I have no such problem with the desire so far. I don't use a taskkiller btw.

Edit: oh yes, the battery life is quite horrible

This post has been edited by prody: Jul 6 2010, 11:35 AM