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!"
During a recent trip to a VZW store to replace my broken 1st-gen MotoQ, I mentioned to the customer support agent that I wanted to switch to AT&T. I was then told to wait a month or so before deciding because the Blackberry Bold was coming out on VZW and would "blow the iPhone away."