I agree with your assessment that it really comes down to personal opinion/choice. But in retrospect I feel the need to point out a few things. Yes the X appears better in some regards on the spec sheets due to the camera and video res plus HDMI out. However, there are pluses to the D2 that really aren't something generally listed under "spec sheet" qualities. For one, the X isn't uniform. To me it's an issue that the camera area at the top end is thicker and heavier. My Boss got the X and till I messed around with his I was set on the X. I didn't like the heavier top feel and the uneven resting on a desk. Then there was the fact that on a belt holster the X is just too darn big for me. It's truly like a brick on your belt. The biggest I'm comfortable with is the iPhone's size.
Then I also don't need the HDMI out nor the extended resolutions since I don't really record much with my phone and I have a PS3 that reads media cards and that I play all my videos on. I copy all my vids and pics to a flash drive anyway - this part here is of course a preference thing.
Back to the specs, the keyboard on the D2 is always just looked at as a keyboard - something that many say they are too lazy to slide out and use. Myself however, I like the fact that I can type while still having 100% the full screen real estate. Again, not something that is touted as a feature but I find extremely valuable. Another non-listed plus is the directional keys on the physical keyboard. Not only can you use them for such things as games on the phone, but for me more importantly I can easily jump up earlier in a paragraph and add or correct things, something I don't see available in the virtual keyboard unless I'm missing something.
I also like the fact that all main screen buttons are touch sensitive - this again is a personal preference.
Not trying to defend the D2 over the X, not by any means. For someone that wants the extended camera/video experience or a larger screen the choice is obvious. I'm just trying to point out the reasons (ie. benefits) as to why one would choose a D2 over an X. While some features on the spec sheet show stronger on the X I think it's a bit unbalanced to those not familiar as to the benefits of the D2, being broken down more than just "It has a physical keyboard".
Rev.