Let the hive mind of Engadget get that for you.
"I just switched to Sprint from Verizon about three months ago for the Pre. Then I went for the Hero about a week ago. Now, I miss my hardware keyboard and am thinking about switching to the Moment. I am still able to switch back to Verizon if I want and get the Droid when it arrives. Should I just trade up to the Moment when it comes out, see if I like it, and if not switch to the Droid? Or something else entirely? Help!"
AT&T customer service sucks for sure, but their network coverage has finally caught up to the point that it's not much of an issue, while they continue to have the better phones much much sooner, not to mention the ability to easily swap out SIMs for hassle free upgrades without permission or fees from the mothership.