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!"
I can't give Kudos to T-Mobile, no matter how great the phone looks. I would never sign up with T-Mobile again ever. They are a greedy, one-way company with only one thing in mind - getting over on the customer any way they can. Too bad that phone wasn't picked up by one of the competition first.