Ubertechie:
Okay well i will pitch in first
Chaos dwarfs are like dwarfs but arent a 1 dimensional army - what do i mean by that ?
Well - they are like dwarfs because they have rock hard infantry, and great shooting and are just plain dependable - however unlike normal dwarves they can compete in every phase instead of just shooting and receving charges.
Movement phase
Bull Centaurs, Wolf Riders, Lamasu and Great Taurus are all speedy and Hobgoblins and all other O&G move at normal infantry speed - Normal dwarves only have the gyrocopter which isn’t fielded that much as the organ gun is a lot better investment
Magic Phase
You can field 4 wizards at 2000 points and be as good as most armies in the magic phase if you choose to be - Normal dwarves cant do ANYTHING in this phase
Combat Phase
Given that you can choose where and when you fight (due to having an army that doesnt dawdle) you can make the most out of your combat units
Shooting
Dwarves have solid all round shooting and runes can make it very effective - however we have the Blunderbuss (probably one of the most hated weapons in warhammer) that can easily shred a T3 infantry unit in 2 rounds of shooting, Cheap Bolt Throwers, Death Rockets (Stone Throwers) and Earth Shakers which not only do damage but mean we can further control the movement phase.
In short play dwarves if you want an army that it easy to get a draw with - play chaos dwarves if you want an army you can win big with but have to engage the grey cells to do so. (oh and BTW i have a regular dwarf army so i am not a dwarf hater its just doesnt get used often as i find it very dull).
I have just posted a battle report Here if you want to read a little about how (i at least) use Chaos Dwarfs
Cheers
Ubertechie