If you are wanting to stay between those phones it would depend on what you want the most out of your phone. I have the X and my wife has the droid 2. If a touch screen is not a problem for you I would take the X over the droid 2, that is the reason she wanted the droid 2 was because of the keyboard. I have to admit I thought I would not be happy with the X because of no keyboard, but the size of the phone makes the keyboard great. Also the battery live on the X is superior to the other phones.
I would by the X again today if I was to go out and go shopping for a new phone. I have had it since August and not had any problems.