What specifically do you like better? I've got the x2 right now and am considering swapping it to the d3.
well for one the interface, i'm a sucker for eyecandy and there are just a ton of nice effects in the interface. On the surface, if you haven't seen any videos, it may looks like the same interface from the x2 or the gingerbread update of the first x, but its actually got a ton of little changes here and there that make it awesome. There are a lot of 3d type effects as you are using the system, and the processor has enough juice to handle all of it without slowing down at all. I even loaded a ton of apps and thought, well maybe it would slow down some then.. nope.
The phone is so responsive in everything i've done, its been a joy to use. And i'm guessing it must be an updated version of swype from what was on my x, cause when i have used swype on here it works so much better.. like some of the really old versions i had used when swype first came out.
The build quality is pretty good, and honestly, its not that thick of a phone, its as thick as the hump part of the dx, and dx2
Only downside i've found so far, was i had just purchased a game from gamelofts website like 4 days before i bought this and it won't transfer over to the droid 3
but that's not the phones fault thats gamelofts fault lol.
i bought the extended battery for it, and i used the phone nonstop for about 5 hours after it had a full charge and it still have 60% left.. like i literally never put the phone down in that 5 hours, so i think thats pretty decent since i usually don't use it THAT much heh.
I made a couple phone calls and i would say that the earpiece sounded much louder than my droid x's.
another thing that i liked was they included a task list widget/app which i used to use one off the market but this is a nice resizeable one that works very well. The zumocast app that comes with it, at first i had kind of brushed it off as bloatware, but if you listen to music its very nice, it basically turns your home computer in to a cloud music service for your phone, and lets you stream music, including drm protecting itunes files, to your phone. works very nicely.
Thats just a bit of the things that have one me over so far